chapter1习题答案

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《外贸英语函电》（第二版）习题答案

《外贸英语函电》（第⼆版）习题答案《外贸英语函电》（第⼆版）习题答案Chapter 1 key to exercises1. Translate the following terms.（1）inside address 封内地址（2）salutation 称呼（3）complimentary close 结尾敬语（4）Ref. No. 参考编号（5）enclosure 附件（6）P.O.Box 邮箱（7）postscript 附⾔（8）full block style 齐头式2. Answer the following questions.（1）How many formats of business letters do we use today? What are they?Three formats are used in writing business letter. They are full block style, modified block style and indented style.（2）What are the standard parts of a business letter?There are seven standard parts which includes letterhead, date, inside address, salutation, body of the letter, complimentary close and signature.（3）What kinds of information should be written on an envelop? And what are their positions?The information of the sender and the receiver should be written on an envelop. The information of the sender is at the top-left corner, while the information of the receiver is almost in the middle of the envelop.3. Complete the structure of the following business letter which is with full block style and write down the names of the missing parts in the boxes.Date Body of the letter Complimentary closeChapter 2key to exercises1.Translate the following terms.(1) 传真信号; (2) 传真机储存器已满; (3) 电⼦邮件; (4) 通信错误，传输信号不好;(5) 接收⽅传真机忙，传真机重拨2.Translate the following sentences into English.(1)We have to apologize to you for not answering your letter in time.(2)Please confirm the order and e-mail a shipping schedule.(3)As soon as the goods are available, we’ll inform you by fax.(4)If you find our offer acceptable, please fax us for confirmation.(5)We are e-mailing you to enquire whether you’d be willing to establish business relation s with us.3.Translate the following sentences into Chinese.(1)如果存取⽂件有任何问题请和我联系。

计算机网络：自顶向下方法-课本课后习题答案(1-3)

课后习题答案：Chapter 1:Review questions: 1,4,11,13,15,16,18,19,23,25,261没有不同，在本文书中，“主机”和“终端系统”可以互换使用。

终端系统包括PCs ，工作站，Web 服务器，电子邮件服务器，连接Internet 的PDA ，WebTV 等。

41 通过电话线拨号调制解调器：住宅2 通过电话线的DSL ：住宅或小型办公室3 光纤电缆：住宅4 100 Mbps 交换以太网：公司5 无线LAN ：移动电话6 蜂窝移动接入（例如WAP ）：移动电话11电路交换网络可以为一个通话保证特定数量的端到端带宽。

大多数现在分组交换网络（包括Internet ）可以提供所有端到端带宽保证。

13在时间t0发送主机开始传输。

在t1 = L/R1时，发送主机完成传输并且整个分组到达路由器（没有传播延迟）。

因为路由器在时间t1拥有整个分组，所以它在时间t1开始向接收主机传输此分组。

在时间t2 = t1 + L/R2，路由器完成传输并且接收主机接收整个分组（也没有传播延迟）。

因此端到端延迟是L/R1 + L/R2。

15a) 可以支持两个用户因为每个用户需要一半的链路带宽。

b) 因为在传输过程中每个用户需要1Mbps ，如果两个或更上用户同时传输，那么最大需要2Mbs 。

因为共享的链路的可用带宽是2Mbps ，所以在链接之前没有排队延迟。

然而，如果三个用户同时传输，那么需要的带宽将是3Mbps ，它大于共享链路的可用带宽，在这种情况下在链接前存在排队延迟。

c) 给定用户传输的概率是0.2。

d) 所有三个用户同时传输的概率是()333133--⎪⎪⎭⎫ ⎝⎛p p = (0.2)3 = 0.008。

因为当所有用户都传输时，队列增加，所以在队列增加的分数（它等于所有三个用户同时传输的概率）是0.008。

16延迟组件是处理延迟，传输延迟，传播延迟和排队延迟。

除了排队延迟是变化的，其它所有延迟都是固定的。

泛函分析Rudin习题1

i 1
t1 A t n A C ,
这蕴涵着 C co ( A) ;进一步,
CC
C co( A) .反过来的包含由 co( A) C 给出.

3.Proof. (a)设 A X 是开的, C 是 A 的凸壳,那么 A C 蕴涵着 A C .定理 1.13 说C 是凸的,再由第 2 题就得到 C C ;进一步, C C 是开的. (b)设 E X 是有界的, B 是 X 的一个凸局部基.对每个 V B ,选取t 0 使 E tV .第 2 题指出 co( E ) tV .第 5 题因此指出 co( E ) 是有界的. (c)对 0 X 的每个邻域V ,选取 0 X 的邻域U 和 t 0 使U U V , A tU , B tU . 那么 A B tU tU tV .第 5 题因此指出 A B 是有界的. (d)是 X 中加法连续性的结果. (e)设 x A B ,那么 ( x A) B .选取 0 X 的一个邻域V 使
f (V ) ( 1 (V ))
是 Y 的开集.因此 f 是开的. 反过来的蕴涵是明显的. 这就完成了证明.

10.Proof. (a)设 dimY n , e1 , , en X 使 e1 , , en 成为 Y 的一组基.给定 0 X 的邻域 V ,标量乘法的连续性给出一个 0 使
5 Chapter 1: Topological Vector Spaces
是 0 Y 的一个邻域. 同样的推理可以用到 (V ) 的每个点.因此 (V ) ,从而 ,是开的. (b)设 : X / N Y 是诱导的向量空间同构.作为 N 是闭子空间的推论得到: X / N 是一个有限维拓扑向量空间;结合定理 1.21 就得到还是一个同胚. 再由和第 9 题即得.

米什金货币金融学英文版习题答案chapter1英文习题

米什金货币金融学英文版习题答案chapter1英文习题Economics of Money, Banking, and Financial Markets, 11e, Global Edition (Mishkin) Chapter 1 Why Study Money, Banking, and Financial Markets?1.1 Why Study Financial Markets?1) Financial markets promote economic efficiency byA) channeling funds from investors to savers.B) creating inflation.C) channeling funds from savers to investors.D) reducing investment.Answer: CAACSB: Reflective Thinking2) Financial markets promote greater economic efficiency by channeling funds from ________ to ________.A) investors; saversB) borrowers; saversC) savers; borrowersD) savers; lendersAnswer: CAACSB: Reflective Thinking3) Well-functioning financial markets promoteA) inflation.B) deflation.C) unemployment.D) growth.Answer: DAACSB: Reflective Thinking4) A key factor in producing high economic growth isA) eliminating foreign trade.B) well-functioning financial markets.C) high interest rates.D) stock market volatility.Answer: BAACSB: Reflective Thinking5) Markets in which funds are transferred from those who have excess funds available to those who have a shortage of available funds are calledA) commodity markets.B) fund-available markets.C) derivative exchange markets.D) financial markets.Answer: DAACSB: Application of Knowledge6) ________ markets transfer funds from people who have an excess of available funds to people who have a shortage.A) CommodityB) Fund-availableC) FinancialD) Derivative exchangeAnswer: CAACSB: Application of Knowledge7) Poorly performing financial markets can be the cause ofA) wealth.B) poverty.C) financial stability.D) financial expansion.Answer: BAACSB: Reflective Thinking8) The bond markets are important because they areA) easily the most widely followed financial markets in the United States.B) the markets where foreign exchange rates are determined.C) the markets where interest rates are determined.D) the markets where all borrowers get their funds.Answer: CAACSB: Reflective Thinking9) The price paid for the rental of borrowed funds (usually expressed as a percentage of the rental of $100 per year) is commonly referred to as theA) inflation rate.B) exchange rate.C) interest rate.D) aggregate price level.Answer: CAACSB: Application of Knowledge10) Compared to interest rates on long-term U.S. government bonds, interest rates on three-month Treasury bills fluctuate ________ and are ________ on average.A) more; lowerB) less; lowerC) more; higherD) less; higherAnswer: AAACSB: Reflective Thinking11) The interest rate on Baa corporate bonds is ________, on average, than interest rates on Treasuries, and the spread between these rates became ________ in the 1970s.A) lower; smallerB) lower; largerC) higher; smallerD) higher; largerAnswer: DAACSB: Reflective Thinking12) Everything else held constant, a decline in interest rates will cause spending on housing toA) fall.B) remain unchanged.C) either rise, fall, or remain the same.D) rise.Answer: DAACSB: Analytical Thinking13) High interest rates might ________ purchasing a house or car but at the same time high interest rates might ________ saving.A) discourage; encourageB) discourage; discourageC) encourage; encourageD) encourage; discourageAnswer: AAACSB: Analytical Thinking14) An increase in interest rates might ________ saving because more can be earned in interest income.A) encourageB) discourageC) disallowD) invalidateAnswer: AAACSB: Analytical Thinking15) Everything else held constant, an increase in interest rates on student loansA) increases the cost of a college education.B) reduces the cost of a college education.C) has no effect on educational costs.D) increases costs for students with no loans.Answer: AAACSB: Analytical Thinking16) High interest rates might cause a corporation to ________ building a new plant that would provide more jobs.A) completeB) considerC) postponeD) contemplateAnswer: CAACSB: Analytical Thinking17) The stock market isA) where interest rates are determined.B) the most widely followed financial market in the United States.C) where foreign exchange rates are determined.D) the market where most borrowers get their funds.Answer: BAACSB: Reflective Thinking18) Stock prices areA) relatively stable trending upward at a steady pace.B) relatively stable trending downward at a moderate rate.C) extremely volatile.D) unstable trending downward at a moderate rate.Answer: CAACSB: Reflective Thinking19) A rising stock market index due to higher share pricesA) increases people's wealth, but is unlikely to increase their willingness to spend.B) increases people's wealth and as a result may increase their willingness to spend.C) decreases the amount of funds that business firms can raise by selling newly-issued stock.D) decreases people's wealth, but is unlikely to increase their willingness to spend. Answer: BAACSB: Analytical Thinking20) When stock prices fallA) an individual's wealth is not affected nor is their willingness to spend.B) a business firm will be more likely to sell stock to finance investment spending.C) an individual's wealth may decrease but their willingness to spend is not affected.D) an individual's wealth may decrease and their willingness to spend may decrease. Answer: DAACSB: Analytical Thinking21) Changes in stock pricesA) do not affect people's wealth and their willingness to spend.B) affect firms' decisions to sell stock to finance investment spending.C) occur in regular patterns.D) are unimportant to decision makers.Answer: BAACSB: Reflective Thinking22) An increase in stock prices ________ the size of people's wealth and may ________ their willingness to spend, everythingelse held constant.A) increases; increaseB) increases; decreaseC) decreases; increaseD) decreases; decreaseAnswer: AAACSB: Analytical Thinking23) Low stock market prices might ________ consumers’ willingness to spend and might________ businesses willingness to undertake investment projects.A) increase; increaseB) increase; decreaseC) decrease; decreaseD) decrease; increaseAnswer: CAACSB: Analytical Thinking24) Fear of a major recession causes stock prices to fall, everything else held constant, which in turn causes consumer spending toA) increase.B) remain unchanged.C) decrease.D) cannot be determined.Answer: CAACSB: Reflective Thinking25) A share of common stock is a claim on a corporation'sA) debt.B) liabilities.C) expenses.D) earnings and assets.Answer: DAACSB: Application of Knowledge26) On ________, October 19, 1987, the stock market experienced its worst one-day drop in its entire history with the DJIA falling by 22%.A) "Terrible Tuesday"B) "Woeful Wednesday"C) "Freaky Friday"D) "Black Monday"Answer: DAACSB: Application of Knowledge27) The decline in stock prices from 2000 through 2002A) increased individuals' willingness to spend.B) had no effect on individual spending.C) reduced individuals' willingness to spend.D) increased individual wealth.Answer: CAACSB: Analytical Thinking28) The Dow reached a peak of over 11,000 before the collapse of the ________ bubble in 2000.A) housingB) manufacturingC) high-techD) bankingAnswer: CAACSB: Application of Knowledge29) When I purchase a corporate ________, I am lending the corporation funds for a specific time. When I purchase a corporation's ________, I become an owner in the corporation.A) bond; stockB) stock; bondC) stock; debt securityD) bond; debt securityAnswer: AAACSB: Application of Knowledge30) What is a stock? How do stocks affect the economy?Answer: A stock represents a share of ownership of a corporation, or a claim on a firm's earnings/assets. Stocks are part of wealth, and changes in their value affect people's willingness to spend. Changes in stock prices affect a firm's ability to raise funds, and thus their investment. AACSB: Application of Knowledge31) Why is it important to understand the bond market?Answer: The bond market supports economic activity by enabling the government and corporations to borrow to undertake their projects and it is the market where interest rates are determined.AACSB: Application of Knowledge1.2 Why Study Financial Institutions and Banking?1) Channeling funds from individuals with surplus funds to those desiring funds when the saver does not purchase the borrower's security is known asA) barter.B) redistribution.C) financial intermediation.D) taxation.Answer: CAACSB: Application of Knowledge2) A financial crisis isA) not possible in the modern financial environment.B) a major disruption in the financial markets.C) a feature of developing economies only.D) typically followed by an economic boom.Answer: BAACSB: Application of Knowledge3) Banks are important to the study of money and the economy because theyA) channel funds from investors to savers.B) have been a source of rapid financial innovation.C) are the only important financial institution in the U.S. economy.D) create inflation.Answer: BAACSB: Reflective Thinking4) BanksA) provide a channel for linking those who want to save with those who want to invest.B) produce nothing of value and are therefore a drain on society's resources.C) are the only financial institutions allowed to give loans.D) hold very little of the average American's wealth.Answer: AAACSB: Reflective Thinking5) Banks, savings and loan associations, mutual savings banks, and credit unionsA) are no longer important players in financial intermediation.B) since deregulation now provide services only to small depositors.C) have been adept at innovating in response to changes in the regulatory environment.D) produce nothing of value and are therefore a drain on society's resources.Answer: CAACSB: Reflective Thinking6) Financial institutions search for ________ has resulted in many financial innovations.A) higher profitsB) regulationsC) respectD) higher riskAnswer: AAACSB: Application of Knowledge7) Banks and other financial institutions engage in financial intermediation, whichA) can hurt the performance of the economy.B) can benefit economic performance.C) has no effect on economic performance.D) involves borrowing from investors and lending to savers.Answer: BAACSB: Reflective Thinking8) Financial institutions that accept deposits and make loans are calledA) exchanges.B) banks.C) over-the-counter markets.D) finance companies.Answer: BAACSB: Application of Knowledge9) The financial intermediaries that the average person interacts with most frequently areA) exchanges.B) over-the-counter markets.C) finance companies.D) banks.Answer: DAACSB: Application of Knowledge10) Which of the following is NOT a financial institution?A) A life insurance companyB) A pension fundC) A credit unionD) A business collegeAnswer: DAACSB: Application of Knowledge11) The delivery of financial services electronically is calledA) e-business.B) e-commerce.C) e-finance.D) e-possible.Answer: CAACSB: Information Technology12) What crucial role do financial intermediaries perform in an economy?Answer: Financial intermediaries borrow funds from people who have saved and make loans to other individuals and businesses and thus improve the efficiency of the economy.AACSB: Reflective Thinking1.3 Why Study Money and Monetary Policy?1) Money is defined asA) bills of exchange.B) anything that is generally accepted in payment for goods and services or in the repayment of debt.C) a risk-free repository of spending power.D) the unrecognized liability of governments.Answer: BAACSB: Application of Knowledge2) The upward and downward movement of aggregate output produced in the economy is referred to as theA) roller coaster.B) see saw.C) business cycle.D) shock wave.Answer: CAACSB: Application of Knowledge3) Sustained downward movements in the business cycle are referred to asA) inflation.B) recessions.C) economic recoveries.D) expansions.Answer: BAACSB: Application of Knowledge4) During a recession, output declines result inA) lower unemployment in the economy.B) higher unemployment in the economy.C) no impact on the unemployment in the economy.D) higher wages for the workers.Answer: BAACSB: Analytical Thinking5) Prior to almost all recessions since 1950, there has been a drop inA) inflation.B) the money stock.C) the growth rate of the money stock.D) interest rates.Answer: CAACSB: Application of Knowledge6) Evidence from business cycle fluctuations in the United States indicates thatA) a negative relationship between money growth and general economic activity exists.B) recessions are usually preceded by declines in bond prices.C) recessions are usually preceded by dollar depreciation.D) recessions are usually preceded by a decline in the growth rate of money.Answer: DAACSB: Reflective Thinking7) ________ theory relates the quantity of money and monetary policy to changes in aggregate economic activity and inflation.A) MonetaryB) FiscalC) FinancialD) SystemicAnswer: AAACSB: Application of Knowledge8) A continuing increase in the growth of the money supply is likely followed byA) a recession.B) a depression.C) an increase in the price level.D) no change in the economy.Answer: CAACSB: Reflective Thinking9) It is true that inflation is aA) continuous increase in the money supply.B) continuous fall in prices.C) decline in interest rates.D) continually rising price level.Answer: DAACSB: Application of Knowledge10) Which of the following is a TRUE statement?A) Money or the money supply is defined as Federal Reserve notes.B) The average price of goods and services in an economy is called the aggregate price level.C) The inflation rate is measured as the rate of change in the federal government budget deficit.D) The aggregate price level is measured as the rate of change in the inflation rate.Answer: BAACSB: Application of Knowledge11) If the prices would have been much higher ten years ago for the items the average consumer purchased last month, then one can likely conclude thatA) the aggregate price level has declined during this ten-year period.B) the average inflation rate for this ten-year period has been positive.C) the average rate of money growth for this ten-year period has been positive.D) the aggregate price level has risen during this ten-year period.Answer: AAACSB: Analytical Thinking12) From 1950-2014 the price level in the United States increased more thanA) twofold.B) threefold.C) sixfold.D) tenfold.Answer: DAACSB: Reflective Thinking13) Complete Milton Friedman's famous statement, "Inflation is always and everywhere a________ phenomenon."A) recessionaryB) discretionaryC) repressionaryD) monetaryAnswer: DAACSB: Application of Knowledge14) There is a ________ association between inflation and the growth rate of money ________.A) positive; demandB) positive; supplyC) negative; demandD) negative; supplyAnswer: BAACSB: Application of Knowledge15) Evidence from the United States and other foreign countries indicates thatA) there is a strong positive association between inflation and growth rate of money over long periods of time.B) there is little support for the assertion that "inflation is always and everywhere a monetary phenomenon."C) countries with low monetary growth rates tend to experience higher rates of inflation, all else being constant.D) money growth is clearly unrelated to inflation.Answer: AAACSB: Reflective Thinking16) Countries that experience very high rates of inflation may also haveA) balanced budgets.B) rapidly growing money supplies.C) falling money supplies.D) constant money supplies.Answer: BAACSB: Reflective Thinking17) Between 1950 and 1980 in the U.S., interest rates trended upward. During this same time periodA) the rate of money growth declined.B) the rate of money growth increased.C) the government budget deficit (expressed as a percentage of GNP) trended downward.D) the aggregate price level declined quite dramatically.Answer: BAACSB: Reflective Thinking18) The management of money and interest rates is called________ policy and is conducted bya nation's ________ bank.A) monetary; superiorB) fiscal; superiorC) fiscal; centralD) monetary; centralAnswer: DAACSB: Application of Knowledge19) The organization responsible for the conduct of monetary policy in the United States is theA) Comptroller of the Currency.B) U.S. Treasury.C) Federal Reserve System.D) Bureau of Monetary Affairs.Answer: CAACSB: Application of Knowledge20) ________ policy involves decisions about government spending and taxation.A) MonetaryB) FiscalC) FinancialD) SystemicAnswer: BAACSB: Application of Knowledge21) When tax revenues are greater than government expenditures, the government has a budgetA) crisis.B) deficit.C) surplus.D) revision.AACSB: Application of Knowledge22) A budget ________ occurs when government expenditures exceed tax revenues for a particular time period.A) deficitB) surplusC) surgeD) surfeitAnswer: AAACSB: Application of Knowledge23) Budgets deficits can be a concern because they mightA) ultimately lead to higher inflation.B) lead to lower interest rates.C) lead to a slower rate of money growth.D) lead to higher bond prices.Answer: AAACSB: Reflective Thinking24) Budget deficits are important because deficitsA) cause bank failures.B) always cause interest rates to fall.C) can result in higher rates of monetary growth.D) always cause prices to fall.Answer: CAACSB: Reflective Thinking25) When a budget deficit occurs in the United States, the U.S. Treasury finances this deficit byA) borrowing.B) imposing a moratorium of new government spending.C) increasing the tax rate.D) printing more dollars.AACSB: Application of Knowledge26) What happens to economic growth and unemployment during a business cycle recession? What is the relationship between the money growth rate and a business cycle recession? Answer: During a recession, output declines and unemployment increases. Prior to almost every recession in the U.S. the money growth rate has declined; however, not every decline is followed by a recession.AACSB: Reflective Thinking1.4 Why Study International Finance?1) American companies can borrow fundsA) only in U.S. financial markets.B) only in foreign financial markets.C) in both U.S. and foreign financial markets.D) only from the U.S. government.Answer: CAACSB: Diverse and multicultural work environments2) The price of one country's currency in terms of another country's currency is called theA) exchange rate.B) interest rate.C) Dow Jones industrial average.D) prime rate.Answer: AAACSB: Application of Knowledge3) The market where one currency is converted into another currency is called the ________ market.A) stockB) bondC) derivativesD) foreign exchangeAnswer: DAACSB: Application of Knowledge4) Everything else constant, a stronger dollar will mean thatA) vacationing in England becomes more expensive.B) vacationing in England becomes less expensive.C) French cheese becomes more expensive.D) Japanese cars become more expensive.Answer: BAACSB: Analytical Thinking5) Which of the following is most likely to result from a stronger dollar?A) U.S. goods exported aboard will cost less in foreign countries, and so foreigners will buy more of them.B) U.S. goods exported aboard will cost more in foreign countries and so foreigners will buy more of them.C) U.S. goods exported abroad will cost more in foreign countries, and so foreigners will buy fewer of them.D) Americans will purchase fewer foreign goods.Answer: CAACSB: Diverse and multicultural work environments6) Everything else held constant, a weaker dollar will likely hurtA) textile exporters in South Carolina.B) wheat farmers in Montana that sell domestically.C) automobile manufacturers in Michigan that use domestically produced inputs.D) furniture importers in California.Answer: DAACSB: Diverse and multicultural work environments7) Everything else held constant, a stronger dollar benefits ________ and hurts ________.A) American businesses; American consumersB) American businesses; foreign businessesC) American consumers; American businessesD) foreign businesses; American consumersAnswer: CAACSB: Diverse and multicultural work environments8) From 1980 to early 1985 the dollar ________ in value, thereby benefiting American________.A) appreciated; consumersB) appreciated, businessesC) depreciated; consumersD) depreciated, businessesAnswer: AAACSB: Diverse and multicultural work environments9) From 1980 to 1985 the dollar appreciated relative to the British pound. Holding everything else constant, one would expect that, when compared to 1980A) fewer Britons traveled to the United States in 1985.B) Britons imported more wine from California in 1985.C) Americans exported more wheat to England in 1985.D) more Britons traveled to the United States in 1985.Answer: AAACSB: Diverse and multicultural work environments10) When in 1985 a British pound cost approximately $1.30,a Shetland sweater that cost 100 British pounds would have cost $130. With a weaker dollar, the same Shetland sweater wouldhave costA) less than $130.B) more than $130.C) $130, since the exchange rate does not affect the prices that American consumers pay for foreign goods.D) $130, since the demand for Shetland sweaters will decrease to prevent an increase in price due to the stronger dollar.Answer: BAACSB: Diverse and multicultural work environments11) Everything else held constant, a decrease in the value of the dollar relative to all foreign currencies means that the price of foreign goods purchased by AmericansA) increases.B) decreases.C) remains unchanged.D) either increases, decreases, or remains unchanged.Answer: AAACSB: Diverse and multicultural work environments12) American farmers who sell beef to Europe benefit most fromA) a decrease in the dollar price of euros.B) an increase in the dollar price of euros.C) a constant dollar price for euros.D) a European ban on imports of American beef.Answer: BAACSB: Diverse and multicultural work environments13) If the price of a euro (the European currency) increases from $1.00 to $1.10, then, everything else held constantA) a European vacation becomes less expensive.B) a European vacation becomes more expensive.C) the cost of a European vacation is not affected.D) foreign travel becomes impossible.Answer: BAACSB: Application of Knowledge14) Everything else held constant, Americans who love French wine benefit most fromA) a decrease in the dollar price of euros.B) an increase in the dollar price of euros.C) a constant dollar price for euros.D) a ban on imports from Europe.Answer: AAACSB: Application of Knowledge15) From 2000 to 2014, the dollar depreciated substantially against other currencies. This drop in value most likely benefittedA) European citizens traveling in the U.S.B) U.S. citizens traveling in Europe.C) U.S. manufacturers importing parts from abroad.D) U.S. citizens purchasing foreign-made automobiles.Answer: AAACSB: Application of Knowledge16) From 1980-1985, the dollar strengthened in value against other currencies. Who was helped and who was hurt by this strong dollar?Answer: American consumers benefitted because imports were cheaper and consumers could purchase more. American businesses and workers in those businesses were hurt as domestic and foreign sales of American products fell.AACSB: Reflective Thinking1.5 How We Will Study Money, Banking, and Financial Markets1) The basic concepts used in the analytic framework of this text include all of the following EXCEPTA) the not-for-profit nature of most financial institutions.B) a basic supply and demand analysis to explain the behavior of financial markets.C) an approach to financial structure based on transaction costs and asymmetric information.D) the concept of equilibrium.Answer: AAACSB: Application of Knowledge2) Using a unified analytic framework to present the information in the text keeps the knowledgeA) focused on theories that have little to do with actual behavior.B) theoretical and uninteresting.C) abstract and not applicable to real life.D) from becoming obsolete.Answer: DAACSB: Application of Knowledge1.6 Appendix: Defining Aggregate Output, Income, the Price Level, and the Inflation Rate1) The most comprehensive measure of aggregate output isA) gross domestic product.B) net national product.C) the stock value of the industrial 500.D) national income.Answer: AAACSB: Application of Knowledge2) The gross domestic product is theA) the value of all wealth in an economy.B) the value of all goods and services sold to other nations in a year.C) the market value of all final goods and services produced in an economy in a year.D) the market value of all intermediate goods and services produced in an economy in a year. Answer: CAACSB: Application of Knowledge3) Which of the following items are NOT counted in U.S. GDP?A) your purchase of a new Ford MustangB) your purchase of new tires for your old carC) GM's purchase of tires for new carsD) a foreign consumer's purchase of a new Ford MustangAnswer: CAACSB: Reflective Thinking4) If an economy has aggregate output of $20 trillion, then aggregate income isA) $10 trillion.B) $20 trillion.C) $30 trillion.D) $40 trillion.Answer: BAACSB: Analytical Thinking5) When the total value of final goods and services is calculated using current prices, the resulting measure is referred to asA) real GDP.B) the GDP deflator.C) nominal GDP.D) the index of leading indicators.Answer: CAACSB: Application of Knowledge6) Nominal GDP is output measured in ________ prices while real GDP is output measured in ________ prices.A) current; currentB) current; fixedC) fixed; fixedD) fixed; currentAnswer: BAACSB: Application of Knowledge7) GDP measured with constant prices is referred to asA) real GDP.B) nominal GDP.C) the GDP deflator.D) industrial production.Answer: AAACSB: Application of Knowledge8) If your nominal income in 2014 was $50,000, and prices doubled between 2014 and 2017, to have the same real income, your nominal income in 2017 must beA) $50,000.B) $75,000.C) $90,000.D) $100,000.Answer: DAACSB: Analytical Thinking9) If your nominal income in 2014 is $50,000, and prices increase by 50% between 2014 and 2017, then to have the same real income, your nominal income in 2017 must beA) $50,000.B) $75,000.。

药物合成反应 (第三版闻韧) 课后答案Chapter 1 Halogenation Reaction

第一章卤化反应习题及答案1. 根据以下指定原料、试剂和反应条件，写出其合成反应的主要产物。

(1)(CH 3)2NCH 2CH 2OHSOCl 2(2)CuCl 24(3)P, Br 2o(4)CH 2CHCOOCH 3干燥 HBr 2 (5)CH 3CH 2CH 2CH 2CH 2COOHSOCl 24o(6)S CH 32266(7)H 3C CH 3NBS, H 2SO 43o(8)NHCOCH 3CH 3Br 2,CH 3COOH o(9)OHC CH 3CH 2t -BuOCl, CHCl 3o(10)NBS, (C 6H 5)3P(11)KI, H 3PO 4(12)C 6H 5H 3Br 2,Cl 4o (13)CH 3CH CH CH 3232(14)(CH 3)3CCH 2OHHBr(15)OOP2(16)NBS, Et 3N ·3HF 22o(17)OHBr 24o(18)O23o2. 在下列指定原料和产物的反应式中分别填入必需的化学试剂（或反应物）和反应条件。

(1)CH 3CH 2CH 2CH 2CH CHCH 3CH 3CH 2CH 2CHCHCHCH 3Br(2)COOHBr(3)(4)OHBr(5)2CH 2BrBr(6)(7)(CH 3)3CCH 2OH(CH 3)3CCH 2Br(8)OOBocHNO OBocHNBr(9)OOBr OO BrBr2. 在下列指定原料和产物的反应式中分别填入必需的化学试剂（或反应物）和反应条件。

（参考答案）题号答案注释(1) NBS/(PhCO)2O, CCl4, △(2) Br2/HgO/tetrachloroethaneNaNO2, HCl, H2O; 2. HPF6; 3. △ (168℃)(3) 1.(4) Ph3P, Br2, CH3CN, △ (200-340℃)(5) NBS/(PhCO)2O, CCl4refluxing (10min. )acetone,(6) NaI,(7) Bu3P, Br2, DMF(8) NBS/hv, CCl4(9) NBS/(PhCO)2O, CCl4, reflux3. 阅读（翻译）以下有关反应操作的原文，请在理解基础上写出：（1）此反应的完整反应式（原料、试剂和主要反应条件）；（2）此反应的反应机理（历程）。

《逻辑与计算机设计基础》(原书第五版)课后习题答案-chapter01_solutions-5th

1CHAPTER 1© 2016 Pearson Education, Inc.1-1.(a)(1) Calm:(2) 10 mph(3) 100 mphor(b) The microcomputer requires a table or equation for converting from rotations/second to miles/hour. The pulses produced by the rotating disk must be counted over a known period of time, and the table or equation used to convert the binary count to miles per hour.1-2.–34° quantizes to –30° => 1 V => 0001+31° quantizes to +30° => 7 V => 0111 +77° quantizes to +80° => 12 V => 1100 +108° quantizes to +110° => 15 V => 11111-3.*Decimal, Binary, Octal and Hexadecimal Numbers from (16)to (31)1-4.1020301281282131,0723232233,554,4328828,589,934,592=⨯==⨯==⨯=K Bits M Bits G Bits21-5.220 = (1,000,00010 + d ) where d = 48,576 1Tb = 240 = (220)2 = (1,000,000 + d )2= (1,000,000)2 + 2(1,000,000) d + d 2 = 1,000,000,000,000 + 97,152,000,000 + 2,359,627,776 = 1,099,511,627,7761-6.112511212047252133,554,4311 Bits 1 Bits ⇒-=⇒-=1-7.*63202641013275321142(1001101)222277(1010011.101)22222283.625(10101110.1001)2222222174.5625----=+++==+++++==++++++=1-8.1 1 0 0 0 0 0 0 0 0 0 1 0 11-9.*1-10.*a)0.45 × 8 = 3.6 =>0.60 × 8 = 4.8 =>0.80 × 8 = 6.4 =>0.20 × 8 = 3.2 =>10= (16612.3463)8b) (1938.257)10 = (792.41CB)16c) (175.175)10 = (10101111.001011)21-11.*a) (673.6)8= (110 111 011.110)2= (1BB.C)16b) (E7C.B)16= (1110 0111 1100.1011)2= (7174.54)8c) (310.2)4= (11 01 00.10)2= (64.4)81-12.a) 1010 b) 0110 c) 1111001×1100 ×1001 ×0111010000 0110 11110010000 0000 0000001010 0000 11110011010 0110 11110011111000 0110110 11110010000000110110110101341-13.+1000110110101101010000000010000110001101011-----Quotient = 10001R emainder = 1 1-14.(a) 6 × 123 + 8 × 122 + 7 × 121 + 4 = 11608 (b)12 1-15.a)0 1 2 3 4 5 6 7 8 9 A BCDEFGHIJb) 20c) 21012010(.)1120122018201620(4658.8)BCI G -=⨯+⨯+⨯+⨯=1-16.*a) (BEE)r = (2699)1021021114142699111426850r r r r r ⨯+⨯+⨯=⨯+⨯-=By the quadratic equation: r = 15 or ≈ –16.27 ANSWER: r = 15 b) (365)r = (194)102102365194361890r r r r r ⨯+⨯+⨯=⨯+⨯-=By the quadratic equation: r = – 9 or 7 ANSWER: r = 751-17.Errata: The text has an error: 1480 should be 1460. This will be corrected in future printings.Noting the order of operations, first add (34)r and (24)r101010(34)34(24)24(34)(24)58r r r r r r r r r r =⨯+⨯=⨯+⨯+=⨯+⨯Now, multiply the result by (21)r101021(21)(58)10218⨯+⨯⨯⨯+⨯=⨯+⨯+r r r r r r Next, set the result equal to (1480)r and reorganize.21321321010218146161580⨯+⨯+=⨯+⨯+⨯⨯-⨯-⨯-⨯=r r r r r r r r r Finally, find the roots of this cubic polynomial. Solutions are: r = 8, – 1, – 1ANSWER: The chicken has 4 toes on each foot (half of 8).1-18.*a) (0100 1000 0110 0111)BCD = (4867)10= (1001100000011)2 b) (0011 0111 1000.0111 0101)BCD= (378.75)10=(101111010.11)21-19.*(694)10 = (0110 1001 0100)BCD (835)10=(1000 0011 0101)BCD1001 0100 +0011 +0101 1100 1001 +0110 +00001 001010011-20.*(a)101 1000111 1000Move R 011 1100 0 100 column > 0111Subtract 3 −0011011 1001 0Subtract 3 −001101 1001Move R 0 1100 110 100 column > 0111Subtract 3 −00110 1001 110Move R 0100 1110Move R 010 01110Move R 01 001110Move R 0 1001110 Leftmost 1 in BCD numbershifted out: Finished(b) 102101 1000011 1001 0111Move R 001 1100 1011 1 101 and 100 columns > 0111Subtract 3 −0011 -0011001 1001 1000 1Move R 00 1100 1100 01 101 and 100 columns > 0111Subtract 3 −0011 −001100 1001 1001 01Move R 0 0100 1100 101 100 column > 0111Subtract 3 −00110 0100 1001Move R 0010 0100 1101Move R 001 0010 01101Move R 00 1001 001101 100 column > 0111Subtract 3 −001100 0110 001101Move R 0 0011 0001101Move R 0001 10001101Move R 000 110001101 Leftmost 1 in BCDnumber shifted out: Finished 1-21.(a) 10210110011110001st Move L 1 1110002nd Move L 11 110003rd Move L 111 1000 100 column > 100Add 3 00111010 10004th Move L 1 0101 000 100 column > 100Add 3 00111 1000 0005th Move L 11 0000 006th Move L 110 00000 101 column > 100Add 3 00111001 0000 07th Move L 1 0001 00000 Least significant bit in binary number moved in:Finished(b) 103102101100011100101111st Move L 0 11100101112nd Move L 01 1100101113rd Move L 011 100101114th Move L 0111 0010111 100 column > 100Add 3 001161010 00101115th Move L 1 0100 0101116th Move L 10 1000 10111 100 column > 100Add 3 001110 1011 101117th Move L 101 0111 0111 101 & 100 columns > 100Add 3 0011 00111000 1010 01118th Move L 1 0001 0100 1119th Move L 10 0010 1001 11 100 column > 100Add 3 001110 0010 1100 1110th Move L 100 0101 1001 1 101 &100 columns > 100Add 3 0011 0011100 1000 1100 111th Move L 1001 0001 1001 Least significant bit in binary number moved in: Finished1-22.From Table 1-5, complementing the bit B6 will switch an uppercase letter to a lower case letter and vice versa.1-23.a) The name used is Brent M. Ledvina. An alternative answer: use both upper and lower case letters.0100 0010 B 0101 0010 R 0100 0101 E0100 1110 N 0101 0100 T 0010 0000 (SP)0100 1101 M 0010 1110 . 0010 0000 (SP)0100 1100 L 0100 0101 E 0100 0100 D0101 0110 V 0100 1001 I 0100 1110 N0100 0001 Ab) 0100 0010 1101 0010 1100 01010100 1110 1101 0100 1010 00000100 1101 0010 1110 1010 00001100 1100 1100 0101 0100 01000101 0110 1100 1001 0100 11100100 00011-24.1000111 G1101111 o01000001000011 C1100001 a1110010 r1100100 d1101001 i1101110 n1100001 a (Errata: This number appears as 110001, which would be “1”)1101100 l1110011 s0100001 !781-25.*a) (11111111)2b) (0010 0101 0101)BCD c) 011 0010 011 0101 011 0101ASCIId)0011 00101011 01011011 0101ASCII with Odd Parity1-26.a) U+0040 = 01000000b) U+00A2 = 11000010 10100010c) U+20AC = 11100010 10000010 10101100d)U+1F6B2 = 11110000 10011111 10011010 101100101-27.Binary Numbers from (32)to (47) with Odd and Even Parity1-28.Gray Code for Hexadecimal Digits1-29.(a) Wind Direction Gray CodeDirectionCode WordN 000 S 110 E 011 W 101 NW 100 NE 001 SW 111 SE0109(b) Wind Direction Gray Code (directions in adjacent order)DirectionCode WordN 000 NE 001 E 011 SE 010 S 110 SW 111 W 101 NW100As the wind direction changes, the codes change in the order of the rows of this table, as suming that the bottom row is “next to” the top row. From the table, the codes that result due to a wind direction change always change in a single bit.1-30.+The percentage of power consumed by the Gray code counter compared to a binary code counter equals:Number of bit changes using Gray code Number of bit changes using binary codeAs shown in Table 1-6, and by definition, the number of bit changes per cycle of an n-bit Gray code counter is 1 per count = 2n .Number of bit changes using Gray code = 2nFor a binary counter, notice that the least significant bit changes on every increment. The second least significant bit changes on every other increment. The third digit changes on every fourth increment of the counter, and so on. As shown in Table 1-6, the most significant digit changes twice per cycle of the binary counter.Number of bit changes using binary code 11222n n -+++(1)110221(21)122nni i n n i i ++==⎡⎤==-=--=-⎢⎥⎣⎦∑∑ % Power (1)210022n n +=⨯-。

信号与系统奥本海姆习题答案

Chapter 1 Answers1.6 (a).NoBecause when t<0, )(1t x =0.(b).NoBecause only if n=0, ][2n x has valuable.(c).Yes Because ∑∞-∞=--+--+=+k k m n k m n m n x ]}414[]44[{]4[δδ ∑∞-∞=------=k m k n m k n )]}(41[)](4[{δδ ∑∞-∞=----=k k n k n ]}41[]4[{δδ N=4.1.9 (a). T=π/5Because 0w =10, T=2π/10=π/5.(b). Not periodic.Because jt t e e t x --=)(2, while t e -is not periodic, )(2t x is not periodic.(c). N=2Because 0w =7π, N=(2π/0w )*m, and m=7.(d). N=10Because n j j e e n x )5/3(10/343)(ππ=, that is 0w =3π/5, N=(2π/0w )*m, and m=3.(e). Not periodic. Because 0w =3/5, N=(2π/0w )*m=10πm/3 , it ’s not a rational number.1.14 A1=3, t1=0, A2=-3, t2=1 or -1dtt dx )( isSolution: x(t) isBecause ∑∞-∞=-=k k t t g )2()(δ, dt t dx )(=3g(t)-3g(t-1) or dtt dx )(=3g(t)-3g(t+1) 1.15. (a). y[n]=2x[n-2]+5x[n-3]+2x[n-4]Solution:]3[21]2[][222-+-=n x n x n y ]3[21]2[11-+-=n y n y ]}4[4]3[2{21]}3[4]2[2{1111-+-+-+-=n x n x n x n x ]4[2]3[5]2[2111-+-+-=n x n x n xThen, ]4[2]3[5]2[2][-+-+-=n x n x n x n y(b).No. For it ’s linearity.the relationship between ][1n y and ][2n x is the same in-out relationship with (a). you can have a try.1.16. (a). No.For example, when n=0, y[0]=x[0]x[-2]. So the system is memory. (b). y[n]=0.When the input is ][n A δ,then, ]2[][][2-=n n A n y δδ, so y[n]=0. (c). No.For example, when x[n]=0, y[n]=0; when x[n]=][n A δ, y[n]=0. So the system is not invertible.1.17. (a). No.For example, )0()(x y =-π. So it ’s not causal.(b). Yes.Because : ))(sin()(11t x t y = , ))(sin()(22t x t y =))(sin())(sin()()(2121t bx t ax t by t ay +=+1.21. Solution:We have known:(a).(b).(c).(d).1.22. Solution:We have known:(a).(b).(e).(g)1.23. Solution:For )]()([21)}({t x t x t x E v -+= )]()([21)}({t x t x t x O d --= then,(a).(b).(c).1.24.For: ])[][(21]}[{n x n x n x E v -+= ])[][(21]}[{n x n x n x O d --=then,(a).(b).1.25. (a). Periodic. T=π/2.Solution: T=2π/4=π/2.(b). Periodic. T=2.Solution: T=2π/π=2.(d). Periodic. T=0.5. Solution: )}()4{cos()(t u t E t x v π=)}())(4cos()()4{cos(21t u t t u t --+=ππ )}()(){4cos(21t u t u t -+=π )4cos(21t π= So, T=2π/4π=0.51.26. (a). Periodic. N=7Solution: N=m *7/62ππ=7, m=3.(b). Aperriodic.Solution: N=ππm m 16*8/12=, it ’s not rational number.(e). Periodic. N=16 Solution as follow:)62cos(2)8sin()4cos(2][ππππ+-+=n n n n x in this equation,)4cos(2n π, it ’s period is N=2π*m/(π/4)=8, m=1.)8sin(n π, it ’s period is N=2π*m/(π/8)=16, m=1.)62cos(2ππ+-n , it ’s period is N=2π*m/(π/2)=4, m=1. So, the fundamental period of ][n x is N=(8,16,4)=16.1.31. SolutionBecause )()1()(),2()()(113112t x t x t x t x t x t x ++=--=. According to LTI property ,)()1()(),2()()(113112t y t y t y t y t y t y ++=--=Extra problems:Sketch ⎰∞-=t dt t x t y )()(. 1. SupposeSolution:2. SupposeSketch:(1). )]1(2)1()3()[(--+++t t t t g δδδ(2). ∑∞-∞=-k k t t g )2()(δ(2).Chapter 22.1 Solution:Because x[n]=(1 2 0 –1)0, h[n]=(2 0 2)1-, then(a).So, ]4[2]2[2]1[2][4]1[2][1---+-+++=n n n n n n y δδδδδ (b). according to the property of convolutioin:]2[][12+=n y n y(c). ]2[][13+=n y n y][*][][n h n x n y =][][k n h k x k -=∑∞-∞= ∑∞-∞=-+--=k k k n u k u ]2[]2[)21(2 ][211)21()21(][)21(12)2(0222n u n u n n k k --==+-++=-∑ ][])21(1[21n u n +-= the figure of the y[n] is:2.5 Solution:We have known: ⎩⎨⎧≤≤=elsewhere n n x ....090....1][，，, ⎩⎨⎧≤≤=elsewhere N n n h ....00....1][，，,(9≤N ) Then, ]10[][][--=n u n u n x , ]1[][][---=N n u n u n h∑∞-∞=-==k k n u k h n h n x n y ][][][*][][ ∑∞-∞=-------=k k n u k n u N k u k u ])10[][])(1[][(So, y[4] ∑∞-∞=-------=k k u k u N k u k u ])6[]4[])(1[][( ⎪⎪⎩⎪⎪⎨⎧≥≤=∑∑==4,...14, (140)0N N k Nk =5, then 4≥N And y[14] ∑∞-∞=------=k k u k u N k u k u ])4[]14[])(1[][(⎪⎪⎩⎪⎪⎨⎧≥≤=∑∑==14,...114, (1145)5N N k Nk =0, then 5<N ∴4=N2.7 Solution:[][][2]k y n x k g n k ∞=-∞=-∑（a ）[][1]x n n δ=-,[][][2][1][2][2]k k y n x k g n k k g n k g n δ∞∞=-∞=-∞=-=--=-∑∑(b) [][2]x n n δ=-,[][][2][2][2][4]k k y n x k g n k k g n k g n δ∞∞=-∞=-∞=-=--=-∑∑ (c) S is not LTI system..(d) [][]x n u n =,0[][][2][][2][2]k k k y n x k g n k u k g n k g n k ∞∞∞=-∞=-∞==-=-=-∑∑∑2.8 Solution: )]1(2)2([*)()(*)()(+++==t t t x t h t x t y δδ )1(2)2(+++=t x t xThen,That is, ⎪⎪⎪⎩⎪⎪⎪⎨⎧≤<-≤<-+-=-<<-+=others t t t t t t t t y ,........010,....2201,.....41..,.........412,.....3)(2.10 Solution:(a). We know:Then,)()()(αδδ--='t t t h)]()([*)()(*)()(αδδ--='='t t t x t h t x t y )()(α--=t x t xthat is,So, ⎪⎪⎩⎪⎪⎨⎧+≤≤-+≤≤≤≤=others t t t t t t y ,.....011,.....11,....0,.....)(ααααα(b). From the figure of )(t y ', only if 1=α, )(t y ' would contain merely therediscontinuities.2.11 Solution:(a). )(*)]5()3([)(*)()(3t u et u t u t h t x t y t----==⎰⎰∞∞---∞∞--------=ττττττττd t u e u d t u eu t t )()5()()3()(3)(3⎰⎰-------=tt t t d e t u d et u 5)(33)(3)5()3(ττττ⎪⎪⎪⎪⎩⎪⎪⎪⎪⎨⎧≥+-=-<≤-=<=---------⎰⎰⎰5,.......353,.....313.........,.........0315395)(33)(3393)(3t e e d e d e t e d e t tt t t t t t t t ττττττ(b). )(*)]5()3([)(*)/)(()(3t u e t t t h dt t dx t g t ----==δδ)5()3()5(3)3(3---=----t u e t u e t t(c). It ’s obvious that dt t dy t g /)()(=.2.12 Solution∑∑∞-∞=-∞-∞=--=-=k tk tk t t u ek t t u e t y )]3(*)([)3(*)()(δδ∑∞-∞=---=k k t k t u e)3()3(Considering for 30<≤t ,we can obtain33311])3([)(---∞=-∞-∞=--==-=∑∑ee e ek t u e e t y tk k tk kt. (Because k must be negetive ,1)3(=-k t u for 30<≤t ).2.19 Solution:(a). We have known:][]1[21][n x n w n w +-=(1) ][]1[][n w n y n y βα+-=(2)from (1), 21)(1-=E EE Hfrom (2), αβ-=E EE H )(2then, 212212)21(1)21)(()()()(--++-=--==E E E E E E H E H E H ααβαβ∴][]2[2]1[)21(][n x n y n y n y βαα=-+-+-but, ][]1[43]2[81][n x n y n y n y +-+--=∴⎪⎩⎪⎨⎧=⎪⎭⎫ ⎝⎛=+=143)21(:....812βααor ∴⎪⎩⎪⎨⎧==141βα(b). from (a), we know )21)(41()()()(221--==E E E E H E H E H21241-+--=E EE E ∴][)41()21(2][n u n h n n ⎥⎦⎤⎢⎣⎡-=2.20 (a). 1⎰⎰∞∞-∞∞-===1)0cos()cos()()cos()(0dt t t dt t t u δ(b). 0dt t t )3()2sin(5+⎰δπ has value only on 3-=t , but ]5,0[3∉-∴dt t t )3()2sin(5+⎰δπ=0(c). 0⎰⎰---=-641551)2cos()()2cos()1(dt t t u d u πτπττ⎰-'-=64)2cos()(dt t t πδ0|)2(s co ='=t t π 0|)2sin(20=-==t t ππ∑∞-∞=-==k t h kT t t h t x t y )(*)()(*)()(δ∑∞-∞=-=k kT t h )(∴2.27Solution()y A y t dt ∞-∞=⎰,()xA x t dt ∞-∞=⎰,()hA h t dt ∞-∞=⎰.()()*()()()y t x t h t x x t d τττ∞-∞==-⎰()()()()()()()()()(){()}y x hA y t dt x x t d dtx x t dtd x x t dtd x x d d x d x d A A ττττττττττξξτττξξ∞∞∞-∞-∞-∞∞∞∞∞-∞-∞-∞-∞∞∞∞∞-∞-∞-∞-∞==-=-=-===⎰⎰⎰⎰⎰⎰⎰⎰⎰⎰⎰(a) ()()(2)tt y t e x d τττ---∞=-⎰,Let ()()x t t δ=,then ()()y t h t =. So , 2()(2)(2)()(2)()(2)t t t t t h t ed e d e u t τξδττδξξ---------∞-∞=-==-⎰⎰(b) (2)()()*()[(1)(2)]*(2)t y t x t h t u t u t e u t --==+---(2)(2)(1)(2)(2)(2)t t u eu t d u e u t d ττττττττ∞∞-------∞-∞=+------⎰⎰22(2)(2)12(1)(4)t t t t u t e d u t e d ττττ---------=---⎰⎰(2)2(2)212(1)[]|(4)[]|t t t t u t e e u t ee ττ-------=--- (1)(4)[1](1)[1](4)t t e u t e u t ----=-----2.46 SolutionBecause)]1([2)1(]2[)(33-+-=--t u dtde t u e dt d t x dt d t t )1(2)(3)1(2)(333-+-=-+-=--t e t x t e t x t δδ.From LTI property ,we know)1(2)(3)(3-+-→-t h e t y t x dtdwhere )(t h is the impulse response of the system. So ,following equation can be derived.)()1(223t u e t h e t --=-Finally, )1(21)()1(23+=+-t u e e t h t 2.47 SoliutionAccording to the property of the linear time-invariant system: (a). )(2)(*)(2)(*)()(000t y t h t x t h t x t y ===(b). )(*)]2()([)(*)()(00t h t x t x t h t x t y --==)(*)2()(*)(0000t h t x t h t x --=012y(t)t4)2()(00--=t y t y(c). )1()1(*)(*)2()1(*)2()(*)()(00000-=+-=+-==t y t t h t x t h t x t h t x t y δ(d). The condition is not enough.(e). )(*)()(*)()(00t h t x t h t x t y --==τττd t h x )()(00+--=⎰∞∞-)()()(000t y dm m t h m x -=--=⎰∞∞-(f). )()]([)](*)([)(*)()(*)()(000000t y t y t h t x t h t x t h t x t y "=''='--'=-'-'==Extra problems:1. Solute h(t), h[n](1). )()(6)(5)(22t x t y t y dt dt y dtd =++ (2). ]1[][2]1[2]2[+=++++n x n y n y n y Solution:(1). Because 3121)3)(2(1651)(2+-++=++=++=P P P P P P P Hso )()()()3121()(32t u e e t P P t h t t ---=+-++=δ (2). Because )1)(1(1)1(22)(22i E i E EE E E E E E H -+++=++=++=iE Eii E E i -+-+++=1212 so []][)1()1(2][1212][n u i i i k i E E i i E E i n h n n +----=⎪⎪⎪⎪⎭⎫⎝⎛-+-+++=δChapter 33.1 Solution:Fundamental period 8T =.02/8/4ωππ==00000000033113333()224434cos()8sin()44j kt j t j t j t j tk k j t j t j t j tx t a e a e a e a e a e e e je je t t ωωωωωωωωωππ∞----=-∞--==+++=++-=-∑3.2 Solution:for, 10=a , 4/2πj ea --= , 4/2πj ea = , 3/42πj ea --=, 3/42πj ea =n N jk k N k e a n x )/2(][π∑>=<=n j n j n j n j e a e a e a e a a )5/8(4)5/8(4)5/4(2)5/4(20ππππ----++++=n j j n j j n j j n j j e e e e e e e e )5/8(3/)5/8(3/)5/4(4/)5/4(4/221ππππππππ----++++= )358cos(4)454cos(21ππππ++++=n n)6558sin(4)4354sin(21ππππ++++=n n3.3 Solution: for the period of )32cos(t πis 3=T , the period of )35sin(t πis 6=Tso the period of )(t x is 6 , i.e. 3/6/20ππ==w)35sin(4)32cos(2)(t t t x ππ++= )5sin(4)2cos(21200t w t w ++=)(2)(21200005522t w j t w j t w j t w j e e j e e ----++=then, 20=a , 2122==-a a , j a 25=-, j a 25-=3.5 Solution:(1). Because )1()1()(112-+-=t x t x t x , then )(2t x has the same period as )(1t x ,that is 21T T T ==, 12w w =(2). 212111()((1)(1))jkw t jkw tk T T b x t e dt x t x t e dt T--==-+-⎰⎰111111(1)(1)jkw tjkw t T Tx t e dt x t e dt T T --=-+-⎰⎰ 111)(jkw k k jkw k jkw k e a a e a e a -----+=+=3.8 Solution:kt jw k k e a t x 0)(∑∞-∞==while:)(t x is real and odd, then 00=a , k k a a --=2=T , then ππ==2/20wand0=k a for 1>kso kt jw k k e a t x 0)(∑∞-∞==t jw t jw e a e a a 00110++=--)sin(2)(11t a e e a t j t j πππ=-=-for12)(2121212120220==++=-⎰a a a a dt t x∴2/21±=a ∴)sin(2)(t t x π±=3.13 Solution:Fundamental period 8T =.02/8/4ωππ==kt jw k k e a t x 0)(∑∞-∞==∴t jkw k k e jkw H a t y 0)()(0∑∞-∞==0004, 0sin(4)()0, 0k k H jk k k ωωω=⎧==⎨≠⎩ ∴000()()4jkw t k k y t a H jkw e a ∞=-∞==∑Because 48004111()1(1)088T a x t dt dt dt T ==+-=⎰⎰⎰So ()0y t =.kt jw k k e a t x 0)(∑∞-∞==∴t jkw k k e jkw H a t y 0)()(0∑∞-∞== ∴dt e jkw H t y Ta t jkw Tk 0)()(10-⎰=for⎪⎩⎪⎨⎧>≤=100, (0100),.......1)(w w jw H ∴if 0=k a , it needs 1000>kwthat is 12100,........1006/2>>k kππand k is integer, so 8>K3.22 Solution:021)(1110===⎰⎰-tdt dt t x Ta Tdt te dt te dt e t x T a t jk t jk t jkw T k ππ-----⎰⎰⎰===1122112121)(10t jk tde jk ππ--⎰-=1121⎥⎥⎦⎤⎢⎢⎣⎡---=----111121ππππjk e te jk t jk tjk ⎥⎦⎤⎢⎣⎡---+-=--ππππππjk e e e e jk jk jk jk jk )()(21⎥⎦⎤⎢⎣⎡-+-=ππππjk k k jk )sin(2)cos(221[]πππππk jk k j k jk k)1()cos()cos(221-==-=0............≠k404402()()1184416tj tj t t j tt j t H j h t edt ee dte edt e e dtj j ωωωωωωωω∞∞----∞-∞∞----∞===+=+=-++⎰⎰⎰⎰A periodic continous-signal has Fourier Series:. 0()j kt k k x t a e ω∞=-∞=∑T is the fundamental period of ()x t .02/T ωπ=The output of LTI system with inputed ()x t is 00()()jk t k k y t a H jk e ωω∞=-∞=∑Its coefficients of Fourier Series: 0()k k b a H jk ω= (a)()()n x t t n δ∞=-∞=-∑.T=1, 02ωπ=11k a T==. 01/221/21()()1jkw t jk tk T a x t e dt t e dt Tπδ---===⎰⎰ （Note ：If ()()n x t t nT δ∞=-∞=-∑,1k a T=） So 2282(2)16(2)4()k k b a H jk k k πππ===++ (b)()(1)()n n x t t n δ∞=-∞=--∑ .T=2, 0ωπ=,11k a T== 01/23/21/21/2111()()(1)(1)221[1(1)]2jkw t jk tjk t k T k a x t e dt t e dt t e dtT ππδδ----==+--=--⎰⎰⎰So 24[1(1)]()16()k k k b a H jk k ππ--==+, (c) T=1,02ωπ=01/421/4sin()12()jk t jk tk T k a x t e dt e dt Tk ωπππ---===⎰⎰28sin()2()[16(2)]k k k b a H jk k k ππππ==+ 3.35 Solution: T= /7π,02/14T ωπ==.kt jw k k e a t x 0)(∑∞-∞==∴t jkw k k e jkw H a t y 0)()(0∑∞-∞==∴0()k k b a H jkw =for⎩⎨⎧≥=otherwise w jw H ,.......0250,.......1)(,01,. (17)()0,.......k H jkw otherwise ⎧≥⎪=⎨⎪⎩that is 0250250, (14)k k ω<<, and k is integer, so 18....17k or k <≤. Let ()()y t x t =,k k b a =, it needs 0=k a ,for 18....17k or k <≤.3.37 Solution:11()[]()212()21312411511cos 224nj j nj n n n n j nn j nn n j j j H e h n ee ee e e e ωωωωωωωωω∞∞--=-∞=-∞-∞--=-∞=-===+=+=---∑∑∑∑A periodic sequence has Fourier Series:2()[]jk n Nk k N x n a eπ=<>=∑.N is the fundamental period of []x n .The output of LTI system with inputed []x n is 22()[]()jk jk n NNk k N y n a H eeππ=<>=∑.Its coefficients of Fourier Series: 2()jk Nk k b a H eπ=(a)[][4]k x n n k δ∞=-∞=-∑.N=4, 14k a =.So 2314()524cos()44j k Nk k b a H e k ππ==-3165cos()42k b k π=-3.40 Solution: According to the property of fourier series: (a). )2cos(2)cos(20000000t Tka t kw a e a ea a k k t jkw k t jkw k k π==+='- (b). Because 2)()()}({t x t x t x E v -+=}{2k v k k k a E a a a =+='-(c). Because 2)(*)()}({t x t x t x R e +=2*kk k a a a -+='(d). k k k a Tjka jkw a 220)2()(π=='(e). first, the period of )13(-t x is 3T T ='then 3)(1)13(131213120dme m x T dt e t x T a m T jk T t T jk T k +'--'-'-'⎰⎰'=-'='ππTjkk m T jk T T jk T jk m T jk T ea dm e m x T e dm e e m x T πππππ221122211)(1)(1---------=⎥⎦⎤⎢⎣⎡==⎰⎰3.43 (a) Proof:（i ）Because ()x t is odd harmonic ,(2/)()jk T t k k x t a e π∞=-∞=∑,where 0k a = for everynon-zero even k.(2/)()2(2/)(2/)()2T jk T t k k jk jk T tk k jk T tk k T x t a ea e e a e ππππ∞+=-∞∞=-∞∞=-∞+===-∑∑∑It is noticed that k is odd integers or k=0.That means()()2Tx t x t =-+（ii ）Because of ()()2Tx t x t =-+,we get the coefficients of Fourier Series222/200/222(/2)/2/20022/2/200111()()()11()(/2)11()()(1)jk t jk t jk t T T T T T T k T jk t jk t T T T T Tjk t jk t T T k TT a x t e dt x t e dt x t e dtT T T x t e dt x t T e dt T T x t e dt x t e dt T T πππππππ-----+--==+=++=--⎰⎰⎰⎰⎰⎰⎰ 2/21[1(1)]()jk t T kT x t e dt T π-=--⎰It is obvious that 0k a = for every non-zero even k. So ()x t is odd harmonic ,(b)Extra problems:∑∞-∞=-=k kT t t x )()(δ, π=T(1). Consider )(t y , when )(jw H ist(2). Consider )(t y , when )(jw H isSolution:∑∞-∞=-=k kT t t x )()(δ↔π11=T , 220==Tw π(1).kt j k k tjkw k k e k j H a ejkw H a t y 20)2(1)()(0∑∑∞-∞=∞-∞===ππ2=(for k can only has value 0)(2).kt j k k tjkw k k e k j H a e jkw H a t y 20)2(1)()(0∑∑∞-∞=∞-∞===πππte e t j t j 2cos 2)(122=+=- (for k can only has value –1 and 1)。

Sakurai. Modern Quantumn Mechanics 习题答案(chapter 1 )

3
∞
< x 2 >=
−∞
2 ∫ dx' < α | x' > x' < x'| α >
y = x '−< x > ∞
=
−∞
∫ dy < α | y + < x >> ( y + < x >)
2
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= d 2 + < x >2 < (∆x) 2 >= d 2 Also : h2 < (∆p) >= 4d 2
^
^
h ⎛ cos γ ⎜ 2⎜ ⎝ sin γ
sin γ ⎞ ⎟ − cos γ ⎟ ⎠

⎛ c1 ⎞
h ⎛ cos γ ⎜ 2⎜ ⎝ sirγ
（1）、求： S x = 解答： S x =
γ⎞ ⎛ ⎜ cos ⎟ sirγ ⎞⎛ c1 ⎞ h ⎛ c1 ⎞ 2⎟ ⎟⎜ ⎜c ⎟ ⎟ ⇒ψ = ⎜ ⎜c ⎟ ⎟ = 2⎜ γ − cpsγ ⎟ ⎜ ⎠⎝ 2 ⎠ ⎝ 2⎠ ⎜ sin ⎟ ⎟ 2⎠ ⎝
⎛ ⎜ ⎜ ⎜ 当 A‘=-a 时，对应 B’=b，要求α=0，γ=iβ，取归一化得 − a, b = ⎜ ⎜ ⎜i ⎜ ⎝ ⎞ ⎟ 0 ⎟ 1 ⎟ ⎟ 2 ⎟ 1 ⎟ ⎟ 2⎠
5
⎛ ⎞ ⎜ ⎟ ⎜ 0 ⎟ ⎜ 1 ⎟ 当 A‘=-a 时，对应 B‘=-b，要求α=0，γ=—iβ，取归一化得 − a,−b = ⎜ ⎟ ⎜ 2 ⎟ ⎜− i 1 ⎟ ⎜ ⎟ 2⎠ ⎝
4
⎛α ⎞ ⎜ ⎟ （3）、解答：因为 A，B 对易，所以有共同本征态，设其共同本征态为 ⎜ β ⎟ ，本征值为 A`， ⎜γ ⎟ ⎝ ⎠

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一、名词解释1、芽孢：某些细菌在其生长发育后期, 在细胞内形成的一个圆形或椭圆形、壁厚抗逆性强的休眠构造。

2、糖被：包被于某些细菌细胞壁外的一层厚度不定的透明胶状物质, 成分是多糖或多肽。

3、菌落：将单个细菌细胞或一小堆同种细胞接种到固体培养基表面，当它占有一定的发展空间并处于适宜的培养条件时，该细胞就会迅速生长繁殖并形成细胞堆，此即菌落。

4、基内菌丝：当孢子落在固体基质表面并发芽后，就不断伸长、分枝并以放射状向基质表面和内层扩展，形成大量色浅、较细的具有吸收营养和排泄代谢废物功能的基内菌丝5、孢囊：指固氮菌尤其是棕色固氮菌等少数细菌在缺乏营养的条件下，由营养细胞的外壁加厚、细胞失水而形成的一种抗干旱但不抗热的圆形休眠体，一个营养细胞仅形成一个孢囊。

6、质粒：指细菌细胞质内存在于染色体外或附加于染色体上的遗传物质，绝大多数由共价闭合环状双螺旋DNA分子构成。

7、微生物：是指肉眼看不见或看不清楚的微小生物的总称。

包括细菌、放线菌、霉菌、酵母菌和病毒等大类群。

8、鞭毛：是从细菌质膜和细胞壁伸出细胞外面的蛋白质组成的丝状结构，使细胞具有运动性。

9、菌落：将单个或一小堆同种细胞接种到固体培养基表面，经培养后会形成以母细胞为中心的一堆肉眼可见的、有一定形态构造的子细胞集团称菌落。

10、放线菌：一类呈丝状生长、以孢子繁殖、陆生性较强的原核微生物。

11、荚膜：有些细菌在生命过程中在其表面分泌一层松散透明的粘液物质，这些粘液物质具有一定外形，相对稳定地附于细胞壁外面，称为荚膜。

二. 填空1、芽孢的结构一般可分为孢外壁、芽孢衣、皮层和核心四部分。

2、细菌的繁殖方式主要是裂殖，少数种类进行芽殖。

3、放线菌产生的孢子有有性孢子和无性孢子两种。

4、细菌的核糖体的沉降系数是70s 。

5、细菌的鞭毛有三个基本部分，分别为基体，钩形鞘，和鞭毛丝。

6、微生物修复受损DNA的作用有__光复活作用__和_切除修复。

7、基因工程中取得目的基因的途径有_3_条。

8、在低渗溶液中，G+ 菌的肽聚糖被破坏，细胞将涨破。

9、原核细胞通过其附属物称为性菌毛从一个细胞向另一个细胞转移DNA。

10、支原体细胞膜中含有甾醇，与动物相似。

11、脂多糖是革兰氏阴性菌细胞壁特有成分,它由三部分组成，即类脂A、核心多糖和O-特异性侧链。

12、革兰氏阴性菌的细胞壁有两层，内层称为电子致密层，约2-3nm厚以肽聚糖为主要成分，外层称为脂多糖层，约8nm 厚，不含肽聚糖。

13、革兰氏阳性菌的细胞壁有一层,其厚度为20-80nm磷壁酸是革兰氏阳性细菌特有的化学成分。

14、在周质空间中，存在着多种蛋白质，包括: 水解酶类、合成酶类、结合蛋白和受体蛋白。

15、芽孢是某些细菌在生活史的一定阶段形成的没有生长活性的休眠体，对热，干燥和辐射具有抗性。

16、芽孢具有孢外壁、芽孢衣、皮层、芽孢壁、孢芽膜、芽孢质和芽孢核区等多层结构。

17、大肠杆菌鞭毛基体由四个盘状物构成,他们分别称为L-环、P-环、S-环和M-环。

18、荚膜的主要成分有多糖和多肽等，常采用负染色方法进行荚膜染色。

19、有些细菌细胞质内含有聚β-羟基丁酸，这是碳源和能源贮藏物质，而异染色颗粒主要成分是无机偏磷酸的聚合物，它是一种无机磷酸的贮藏物质。

20、蓝细菌的异形胞仅含少量藻胆素，缺乏异形胞，他们不在产生氧气或固定CO2。

这样，它们从结构和代谢上提供一个无氧环境，使固氮酶保持活性。

21、细菌基本形态有球状，杆状和螺旋状三种。

22、细菌的大小是以微米作为计量单位，而病毒的大小是以纳米作为计量单位。

23、细菌细胞壁的主要成分是肽聚糖，它主要由N-乙酰葡萄糖氨、N-乙酰胞壁酸二部分组成。

24、测定微生物细胞大小的单位为微米、纳米。

25、微生物学的奠基人是_巴斯德、_柯赫_ 。

26、根据放线菌菌丝形态和功能，其菌丝可分为营养菌丝、气生菌丝和孢子丝三种。

27、革兰氏染色操作的关键步骤是乙醇脱色。

28、Bacillus thuringiensis是苏云金杆菌的学名，_Thuringiensis_是种名。

29、每种微生物都有自己的最适宜的pH值和一定的pH适宜范围。

大多数细菌的最适pH为_6.5-7.5_，放线菌的最适pH为_7.5-8.0_。

30、在人为条件下，用溶菌酶除尽革兰氏阳性菌原有细胞壁后所得到的仅有一层细胞膜包裹着的圆球状渗透敏感细胞称为原生质体。

31、细菌荚膜的作用是_保护作用_和贮藏养料、作为透性屏障或（和）离子交换系统，可保护细菌免受重金属离子的毒害、表面附着作用、细菌间的信息识别作用。

32、原核微生物的细胞壁特有的组分是_肽聚糖_，它是由_双糖单位_、四肽尾或四肽侧链_和肽桥或肽间桥组成的亚单位聚合而成。

33、微生物的特点是体积小，面积大；吸收多，转化快；生长旺，繁殖快；适应性强，易变异；分布广，种类多。

34、Staphylococcus aureusBacillus 是金黄色葡萄球菌的学名，其中Staphylo coccus 是属名，aureus__是种名。

35、鞭毛主要化学成分为__蛋白质__，鞭毛主要功能为_运动__。

36、脂多糖(LPS)是革兰氏_阴性_菌细胞壁_外膜_层的主要成分，它由_类脂A，核心多糖，O-特异性侧链__三部分构成。

37、细菌的糖被是指_包被于某些细菌细胞壁外的一层厚度不定的透明胶状物质。

包括三种类型，其中包裹在细胞群上的称_菌胶团__。

38、细菌的明胶柱穿刺培养特征常用来鉴别菌株_产蛋白酶_性能。

39、在菌体形态观察中，需要进行制片后才能在显微镜下观察，观察细菌时采取的制片方法是_涂片法，观察放线菌时采取的制片方法是__压（印）片法，观察真菌采取的制片方法是水浸片。

40、原核细胞的细胞膜内陷所形成的囊状或管状结构称间体。

41、是芽孢所特有的化学物质。

一般它随着芽孢的形成而形成，随芽孢的萌发而消失。

42、放线菌是一类介于细菌和真菌之间，又更接近于细菌的原核微生物。

它的菌丝因其形态和功能不同可分、、。

43、革兰氏染色法是鉴别细菌的重要方法，染色的要点如下：先用a 染色，再加b 处理，使菌体着色，然后用c 脱色，最后用d 复染，呈e 为革兰氏阳性反应。

三. 辨别正误1. O-特异侧链决定G+菌细胞壁抗原特异性。

（正确）2. 芽孢形成过程中，芽孢衣形成在前，前芽孢形成在后（错误）3. 原生动物的鞭毛和纤毛都是9+2型的。

（错误）4. 芽孢可保持休眠数千年，遇合适环境可发芽形成一个细胞。

（正确）5. 立克次氏体没有细胞壁，可通过细菌过滤器。

（错误）6. 青霉素可抑制肽尾与肽桥间的转肽作用，从而杀死细菌。

（正确）7. 古生菌细胞壁中不含有肽聚糖。

（正确）8. 原核细胞和真核细胞的细胞膜在结构和功能上有明显的不同。

（错误）9.细菌细胞的分裂面决定了其细胞的排列方式。

（正确）10细菌的下列结构可能会增加其致病性：鞭毛，荚膜，菌毛，脂多糖。

（正确）11.细菌不含有叶绿体，所以不能进行光合作用。

（错误）12.细胞膜是一个流动结构，其上的蛋白易于被除去。

（正确）13.原核细胞和真核细胞的细胞膜在结构和功能上有明显的不同。

（错误）14.衣原体是古生菌。

（错误）15.放线菌的繁殖方式主要是芽殖。

（错误）16.在一定条件下, 细菌的菌落特征可作为其分类鉴定的依据。

（正确）17.枯草芽胞杆菌、大肠杆菌都属于革兰氏阳性菌。

(错误)18.放线菌的细胞构造和细胞壁化学组成与细菌相似，经革兰氏染色也可分成G+ 菌和G- 菌.（错误）19.革兰氏阳性细菌细胞壁的主要成分是垣酸和肽聚糖。

（正确）20.一种细菌的学名是Staphylococcus aureus,其中aureus属名，是拉丁文的名词，Staphyloccus 是种名，是拉丁文的形容词。

（错误）21.细菌是低等原核生物，所以它没有有性繁殖，只具无性繁殖形式。

（正确）22.蓝细菌是一类含有叶绿素a、具有放氧性光合作用的原核生物。

（正确）23.大肠杆菌和枯草芽孢杆菌属于单细胞生物，唾液链球菌和金黄色葡萄球菌属于多细胞生物。

(错误)24.白僵菌是一种常用来生产微生物农药的细菌。

（错误）四. 单项选择1、下述不是磷壁酸的功能的是：AA内毒素B细胞壁抗原特异性C 噬菌体的吸附位点D 调节阳离子进出细胞2、下述细菌能通过细菌过滤器的是：CA大肠杆菌 B 立克次氏体 C 支原体 D 分枝杆菌3、G-菌含有的周质空间BA 是细胞内吞作用位点B 富含消化酶类C 蛋白质合成场所D 含有溶菌酶4、G+细菌细胞壁中含有BA 脂多糖B 磷壁酸C 结晶紫D 溶菌酶5、不是脂多糖的功能的是BA G-细菌细胞壁成分B 允许物质通过外膜C 抗原功能D 内毒素6、球状细菌分裂后排列成链状称为 BA双杆菌 B 链球菌 C 螺旋体 D 葡萄球菌7、异染粒，羧酶体，磁小体称作为 DA 叶绿体B 间体C 菌毛D 内含物8、螺旋体含有而螺菌不含有的是 AA 轴丝B周生鞭毛C菌毛 D 四分体9、趋化性是指微生物能够CA 与土壤表面粘着B 逃避噬菌作用C 向化学刺激运动或避D 在不利条件下求生存10、下列叙述正确的是DA 一个细胞可产生多个芽孢B芽孢进行二分裂C一个细胞产生一个芽孢并保持生长D芽孢是休眠体11、下列不是原核细胞结构的是BA 染色体B 叶绿体C 鞭毛D荚膜12、用光学显微镜可辨别原核和真核细胞之间不同的是DA 核糖体B鞭毛C细胞膜D核13、致病性革兰氏阴性细菌细胞壁组成中具有( C )A.核心多糖B.O-侧链C.类脂AD.脂蛋白14、鞭毛的化学组成主要是( C )A.多糖B.脂类C.蛋白质D.核酸15、在下列微生物中( B )能进行产氧的光合作用.A.链霉菌B.蓝细菌C.紫硫细菌D.大肠杆菌16、下面不属于古细菌的原核微生物是( C )A. 产甲烷菌B. 硫酸盐还原菌C. 反硝化细菌D. 极端嗜盐菌17、原核生物细胞中核糖体沉降系数为（A）A.70SB. 90SC. 60SD.80S18、下面关于芽孢的叙述，正确的是（D）A所有细菌在其生长的一定阶段，均可形成芽孢。

B所有细菌在其生长的全部阶段，均可形成芽孢。

C所有芽孢细菌在其生长的全部阶段，均可形成芽孢。

D所有芽孢细菌在其生长的一定阶段，均可形成芽孢。

19、G+细胞壁的主要化学成分有（D）A. 萄聚糖B.脂多糖C.几丁质D.肽聚糖20、制细菌标本片采取的制片方法是（A）A水浸片法 B.涂片法 C.印片法 D.组织切片法21、G-细胞壁的主要化学成分有（D）A. 萄聚糖B.纤维素C.几丁质D.肽聚糖22、原核微生物能量代谢及很多合成代谢的部位是( A )A.质膜B.线粒体C.高尔基体D.核糖体23、显微镜中,物镜的放大倍数越大,工作距离( B )A.越长B.越短C.不变D.无法判断24、E.coli细菌的鞭毛着生位置是（D）A.偏端单生B.两端单生C.偏端丛生D.周生鞭毛25、细菌细胞的( A)结构与其抗原性相关。