2005年电子科技大学软件工程(数学)考研试题
2005年电子科技大学206电子测量(高校教师)考研试题
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电子科技大学 2005 年高等学校教师在职攻读硕士学位入学试题 考试科目： 考试科目：206 电子测量
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成都电子科技大学数学分析2005-2016年考研初试真题+答案
共2页第1页 电子科技大学2016年攻读硕士学位研究生入学考试试题考试科目: 601 数学分析注： 所有答案必须写在答题纸上，写在试卷或草稿纸上均无效。
一、 填空题(每小题5分, 共25分)1. 极限()=-→2tan 12lim x x x π .2. 若直线x y =与曲线x y a log =相切，则=a ，切点坐标为 .3. 抛物线642+-=x x y 与直线2+=x y 所围成的图形面积=A .4. 设函数),(y x f z =由方程z y x xe z y x 2+-=--所确定，则=∂∂xz . 5. 设区域D 由直线x y =，2=x 及曲线2=xy 所围成，则二重积分⎰⎰Dy x y x f d d ),(先对x后对y 的累次积分为 .二、计算题（每小题7分, 共14分）1. 设函数)(x y y =由参数方程⎩⎨⎧==,sin ,cos t at y t at x 所确定，求22d d x y ； 2. 求幂级数∑∞=--11212n n n x 的和函数及定义域. 三、计算题（每小题8分, 共16分） 1. 计算⎰-107d x a x x ，其中a 为常数；2. 计算第二类曲线积分[]()⎰-++-=L x x y ax y e x y x b y eI d cos d )(sin ，其中b a ,为正常数，L 为曲线22x ax y -=上从)0,2(a 到)0,0(的一段.四、（14分）证明：3)(x x f =在),[∞+a （0>a ）上一致连续.五、（12分）设函数)(),(x g x f 在区间],[b a 上连续，且在),(b a 内可导，证明：存在),(b a ∈ξ，使得)(')()(')()()()()()(ξξg a g f a f a b b g a g b f a f -=.六、（12分）证明：函数项级数∑∞=+12821n x n x n 在),(∞+-∞上一致收敛. 七、（14分）证明：曲面a z y x =++（0>a ）上任意一点的切平面在各坐标轴上的截距之和等于a . 八、（15分）计算三重积分⎰⎰⎰Ω⎪⎭⎫ ⎝⎛++=z y x z y x I d d d 5222，其中Ω为球体}2|),,{(222z z y x z y x ≤++.。
电子科技大学(成都)考研历年真题之820计算机专业基础2005--2015年考研真题
《计算机操作系统》
一、 填空题（10 分，每空 2 分） 1. 现有 3 个同时到达的作业 J1、 J2 和 J3， 它们的执行时间分别为 T1、 T2 和 T3， 且 T1<T3<T2。 若这三个作业在同一台处理器上以单道方式运行，则平均周转时间最小的执行顺序是 ____。 2. 若一个信号量的初值是 5，经过多次 P、V 操作以后，其值变为-3，则此时等待进入临 界区的进程数目是____。 3. 某基本分页存储管理系统具有快表，内存访问时间为 2 µs ，检索快表的时间为 0.5 µs 。 若快表的命中率为 80%，且忽略快表更新时间，则有效访问时间是____ µs 。 4. 在段页式存储管理系统中， 若不考虑快表， 为获得一条指令或数据， 至少需要访问_____ 次内存。 5. 某虚拟存储器中的用户空间共有 32 个页面，每页 1KB，主存 16KB。假设某时刻系统为 用户的第 0、1、2、3 页分别分配的物理块为 5、10、4、7，则虚拟地址 0A6F 对应的物 理地址是_______（请使用十六进制表示） 。 二、 选择题（14 分，每ቤተ መጻሕፍቲ ባይዱ 2 分） 1. 现代操作系统中最基本的两个特征是（ ） 。 A. 共享和不确定 B. 并发和虚拟 C. 并发和共享 D. 虚拟和不确定 2. 引入多道程序技术的前提条件之一是系统具有（ ） 。 A. 分时功能 B. 中断功能 C. 多 CPU 技术 D. SPOOLing 技术 3. 操作系统是根据（ ）来对并发执行的进程进行控制和管理的。 A. 进程的基本状态 B. 进程调度算法 C. 进程的优先级 D. 进程控制块 4. 在段页式存储管理系统中，地址映射表是（ ） A. 每个进程一张段表，一张页表。 B. 每个进程一张段表，每个段一张页表。 C. 每个进程的每个段一张段表，一张页表。 D. 每个进程的每个段一张段表，多张页表。
电子科技大学(成都)820计算机专业基础2016到2010,2008到2005十一套考研真题
D. 稀疏矩阵
3. 下列选项中符合前缀码要求的是( )。
A. {0, 1} B. {0, 01, 001, 0001} C. {10, 010, 110, 101} D. {01, 10, 1001, 0110}
4. 下列关于哈夫曼树的论述不正确的是( )。
A. 哈夫曼树又被称为最优二叉树
B. 哈夫曼树是带权路径最短的二叉树 C. 一棵哈夫曼树任意交换左右子树仍然是一棵哈弗曼树 D. 对给定的输入数值集合所生成的哈夫曼树深度是确定的 5. 无向图做深度优先搜索和广度优先搜索共有的特点是( )
A. 都是递归类算法 B. 都必须用到栈 C. 都是遍历类算法 D. 搜索结果都是唯一的
6. 对于 AOE 网络，若它的关键路径存在，那么该路径一定是( )。
A. 最长路径 B. 最短路径 C. 拓扑排序序列 D. 唯一的一条路径
7. 拓扑排序解决的问题是( )。
A. 对一个有向图进行遍历操作 B. 计算一个有向图的回路个数
D．MOV R0,addr； 把地址处的内存数据放入寄存器 R0 中
2. 在下列进程调度算法中，不存在进程饥饿现象的调度算法是（ ）。
A．先来先服务
B．反馈调度算法
C．短进程优先
D．基于静态优先级调度算法
3. 资源的有序分配策略是为了破坏死锁产生的（ ）条件。
A．互斥
B．请求和保持
C．非剥夺
D．循环等待
4. 在段式存储管理系统中，若不考虑快表，为获得一条指令或数据，至少需要访问（ ）
次内存。
ቤተ መጻሕፍቲ ባይዱ
A．1
B．2
C．3
D．4
5. 在设备管理中，不属于 I/O 控制方式的是（ ）。
电子科技大学秋季软件工程硕士入学考试试题+答案
电子科技大学秋季软件工程硕士入学考试试题答案考试科目： 301 计算机原理一﹑单项选择题（每小题1分，共10分）请从每小题的四个备选答案中选择一个正确答案。
1、下列关于补码除法的叙述中，错误的是（③）。
①操作数用补码表示②符号位参加运算③根据余数的正负决定商值④根据商值决定下一步操作2、在DMA传送中，主存地址和读/写命令（③）。
①由CPU发出②由总线控制器发出③由DMA控制器发出④由设备控制器发出3、堆栈指针SP存放（①）。
①栈顶单元的地址②栈顶单元的内容③栈底单元的地址④栈底单元的内容4、下列关于静态存储器的叙述中，正确的是（①）。
①依靠触发器存储信息②常用作大容量主存③所存内容静止不变④读出后需重写5、CPU响应中断后，保存断点的操作由（②）完成。
①现行程序②硬件③中断服务程序④专用子程序6、串行接口是指（③）串行传送数据。
①接口与系统总线之间②接口的两侧③接口与外设之间④接口内部7、下列关于微程序控制方式的叙述中，错误的是（④）。
①一段微程序包含若干条微指令②一条微指令包含一步操作所需的微命令③微程序存放在CPU中④微命令用逻辑式表示8、下列选项中，能引起外部中断的事件是（①）。
①键盘输入②除数为0 ③浮点运算下溢④访存缺页9、下列寄存器中，可被CPU编程访问的寄存器是（②）。
①存储器地址寄存器MAR ②程序计数器PC③存储器数据寄存器MDR ④指令寄存器IR10、按数据传送格式划分，常将总线分为（②）。
①同步总线与异步总线②并行总线与串行总线③存储总线与I/O总线④系统总线与外总线二、判断题（每小题1分，共10分）共3页第1页下列说法有的正确，有的错误，请作出正/误判断。
1、在原码除法中，够减商1，不够减商0。
正2、在同步控制方式中，时钟周期长度也可以按需改变。
错3、可以用传送指令实现I/O操作。
正4、中断向量表中存放的是中断源的向量地址。
错5、PCI总线常用来连接运算部件和寄存器。
错6、DMA方式常用来实现外设与CPU之间的数据传送。
电子科大历年信号与系统考研试题
2. 试求系统的单位冲激响应 ht ；
3. 若输入 x t et , t ，试求系统的输出 y t ；
4. 该系统是否稳定，是否因果。
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2005年信号与系统考研试题
五、（16分）某离散时间系统的差分方程为：
yn 5 yn 1 1 yn 2 f n 1
电子科技大学
2008 年攻读硕士学位研究生入学试题
考试科目：836 信号与系统和数字电路
1.（15 分）完成下列卷积和与卷积积分的运算：
⑴．已知 x1n n n 1， x2 n 2n un 1 un 2
计算 xn x1n x2 n ，并画出 xn的波形；
⑵．已知 x1 t ut u t 2 ， x2 t x1 2t
2009年信号与系统考研试题
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（15
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3. (9 分) 实基带信号 xt 具有频谱 X j 0 , 100 ，假定 y t xt e jct ，试
3. 画出系统的幅频特性曲线，说明这是一个什么类型的系统。
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2007年信号与系统考研试题
1. （10 分）某离散时间系统的输入为 xn，输出为 yn ，其输入输出关系为
y
2005年电子科技大学软件工程(英语)考研试题
电子科技大学软件工程硕士研究生入学考试英语试卷2005111217034180Part I Vocabulary and Structure (20 points)1. It is so hot. You should put the food into the refrigerator now. Otherwise, it will soon _______.A. harmB. hurtC. spoilD. damage2. The shortage of energy is getting worse. It _______ an immediate solution.A. calls offB. calls upC. calls forD. calls at3. No one can avoid _______by advertisements.A. influencedB. influencingC. to influenceD. being influenced4. Johnny’s mouth watered at the _____of the delicious cake.A. sightB. lightC. touchD. notice5. If you continue stealing, you will surely ______ in prison.A. grow upB. end upC. put upD. bring up6.We live too far from the city to get a strong television ____.A. signB. markC. signalD. symbol7.It’s time we ______ strong action against crime.A. would takeB. will takeC. tookD. take8.Please _____ all the words in the poem that suggest despair.A. single outB. work outC. pick outD. take out9.We don’t enjoy hot weather in summer , but we have to ____ it , don’t we?A. live byB. live onC. live offD. live with10. Amelia ____to reach the hotel in time for the dinner party and was met by the host at the gate.A. triedB. attemptedC. managedD. wanted11. The management has authorized wage increases for all ______.A. employersB. citizensC. employeesD. residents12. There was little ____ he could do for us.A. thatB. whichC. whomD. why13. To make up an objective test, the teacher writes a series of questions, _____has only one correct answer.A. some of whichB. each of whichC. whichD. that14. Had he worked harder, he _____the exams.A. must have got throughB. could get throughC. would get throughD. would have got through15. You _______yesterday if you were really serious about the job.A. ought to comeB. ought to be comingC. ought to have comeD. ought have come16. Only residents here enjoy the ______of using this parking lot.A. privilegeB. possibilityC. favorD. right17. It ________that the mysterious visitor was an old friend of my grandmother.A. turned upB. turned offC. turned onD. turned out18. It is not ______ that our team lost this time.A surprisinglyB surprisedC surprisingD surprise19. The technician at last succeeded in ______ a fault in the machine.A tracking downB slowing downC making upD keeping up20. The burglars were trying to ______ how to open the safe.A find forB find outC find againstD find up21. You should read these articles yourself before you make ______ on them.A. impressionsB. commentsC. reactionsD. opinions22. Many children chose “Animal World” as their ______ TV programme.A. preferredB. preferableC. favorableD. favorite23. The twins look so much alike that we can hardly ______ one from the other.A. separateB. contrastC. distinguishD. compare24. ______ to what I thought, he has proved to be successful.A. ContentB. ComplexC. ContractD. Contrary25. The tourist industry ______ greatly to the economy of that country.A. supportsB. benefitsC. contributesD. assists26.In the party no one took much ______ of an old man in a black suit.A. attentionB. focusC. interestD. notice27. ______ plan you adopt, you will meet with difficulties in carrying it out.A. No matterB. HoweverC. WhicheverD. What28. She was so disappointed; I ______ her the truth.A. ought not to tellB. ought to not tellC. ought to not have toldD. ought not to have told29. He was a very honest official and never ______ any gift from people who sought his help.A. acceptedB. receivedC. occupiedD. extended30. The policeman went from house to house, ______ whether anyone had seen the lost boy.A. requiringB. acquiringC. inquiringD. informing31. Taken in time, the medicine can be quite ______.A. effectiveB. affectedC. efficientD. sufficient32. I’ve made an ______ for you to see the dentist at 5 o’clock tomorrow.A. interviewB. opportunityC. appointmentD. occasion33. This type of work is far ______ the capacity of many children.A. moreB. beyondC. belowD. beneath34. The old lady was not ______ to survive the operation if she got any worse.A. possibleB. probableC. likeD. likely35. Newspapers and magazines ______ the secret agreement between the government and the opposition forces.A. explodedB. exposedC. exploredD. exploited36. The doctor examines his patient at ______ intervals to make sure that everything is normal.A. regularB. adequateC. mediumD. moderate37. Advertising is different from other forms of communication ______ the advertiser pays for the message to be delivered.A. in whichB. by whichC. in thatD. by that38. Knowing Jack to be a dishonest man, I demanded that he ______ me nothing but the truth.A. tellsB. tellC. toldD. must tell39. The meeting had to be ______ because of the absence of chairman of the board.A. called outB. called offC. called onD. called up40. ______ to give her an expensive gift for her birthday, I can’t go back on my word.A. To promiseB. Having promisedC. PromisedD. Being promisedPart II. Cloze (10 points)Washoe is a young chimpanzee (). She is no _41_ chimpanzee, though. Scientists are doing a research on her. They want to see how civilized () she can __42__. Already she does many things a human being can do.For example, she has been learning how to exchange messages with people. The scientists are teaching her _43_ language. When she wants to be picked _44_, Washoe points up with one finger. She rubs her teeth with her finger when she wants to brush her teeth. This is done after every meal.Washoe has also been _45_ to think out and find answers to problems. Once she was put in a room with food hanging from the ceiling. It was too high to _46_ . After she considered the problem, shegot a tall box to stand __47__. The food was still too high to be reached. Washoe found a long pole. Then she climbed onto the box, grasped the pole, and __48__ down the food with the pole.Washoe lives like a human, too. The scientists keep her in a fully furnished () house. After a hard day in the laboratory, she goes home, then she plays with her toys. She __49__ enjoys watching television before going to bed.Scientists hope to __50__ more about people by studying our closest, relative chimpanzee.41. A. foolish B. ordinary C. special D. simple42. A. experience B. change C. develop D. become43. A. sign B. human C. spoken D. foreign44. A. out B. at C. on D. up45. A. raised B. trained C. ordered D. led46. A. pull B. see C. eat D. reach47. A. by B. on C. up D. with48. A. knocked B. picked C. took D. shook49. A. quite B. already C. even D. still50. A. observe B. discover C. gain D. learnPart III. Reading Comprehension (30%)Directions: There are three passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A,B, C and D. You should decide on the best choice and blacken the corresponding letter on the Answer Sheet.Passage 1Questions 51 to 55 are based on the following passage:Today anyone will accept money in exchange for goods and services. People use money to buy food, furniture, books, bicycles and hundreds of others they need or want. When they work, they usually get paid in money.Most of the money today is made of metal or paper. But people used to use all kinds of things as money. One of the first kinds of money was shells.Shells were not the only things used as money. In China, cloth and knives were used. In the Philippine Islands, rice was used as money. In parts of Africa, Cattle were one of the earliest kinds of money. Other animals were used as money, too.The first metal coins were made in China. They were around and had a square hole in the center. People strung them together and carried them from place to place.Different countries have used different metals and designs for their money. The first coins in England were made of tin. Sweden and Russia used copper to make their money. Later, othercountries began to make coins of gold and silver.But even gold and silver were inconvenient if you had to buy something expensive. Again the Chinese thought of a way to improve money. They began to use paper money. The first paper money looked more like a note from one person to another than paper money used today.Money has had an interesting history from the days of shell money until today.51. Which of the following can be cited as an example of the use of money in exchange for services?A. To sell a bicycle for $20.B. To get some money for old books at a garage sale.C. To buy things you need or want.D. To get paid for your work.52. Where were shells used as money in history?A. In the Philippines.B. In ChinaC. In AfricaD. We don’t know53.Why, according to the passage, did ancient Chinese coins have a square hole in the center?A. Because it would be easier to put them together and carry them around.B. Because it would be lighter for people to carry them from place to place.C. Because people wanted to make it look nicer.D. Because people wanted to save the expensive metal they were made from.54. Why does the author say that even gold and silver were inconvenient if you had to buy something expensive?A. Because they are easy to steal.B. Because they are difficult for people to obtain.C. Because they are not easy to carry around.D. Because they themselves are expensive, too.55. Which do you choose as the best title for this passage?A. Money and Its UsesB. Different Things used as MoneyC. Different Countries, Different MoneyD. The History of MoneyPassage 2Questions 56 to 60 are based on the following passage:Like fine food, good writing is something we approach with pleasure and enjoy from the first taste to the last. And good writers, like good cooks, do not suddenly appear full-blown. Quite the contrary,just as the cook has to undergo an intensive training, mastering the skills of his trade, the writer must sit at his desk and devote long hours to achieving a style in his writing, whatever its purpose -- schoolwork, matters of business, or purely social communication. You may be sure that the more painstaking the effort, the more effective the writing, and the more rewarding.There are still some remote places in the world where you might find a public scribe to do your business or social writing for you, for a fee. There are a few managers who are lucky enough to have the service of that rare kind of secretary who can take care of all sorts of letter writing with no more than a quick note to work from. But for most of us, if there is any writing to be done, we have to do it ourselves.We have to write school papers, business papers or home papers. We are constantly called on to put words to paper. It would be difficult to count the number of such words, messages, letters, and reports put into the mails or delivered by hand, but the daily figure must be enormous. What is more, everyone who writes expects, or at least hopes, that his writing will be read. We want to arouse ( ) and hold the interest of the readers. We want whatever we write to be read, from first word to last, not just thrown into some "letters-to-be-read" file () or into a wastepaper basket. This is the reason we bend our efforts toward learning and practising the skills of interesting, effective writing.56. In this passage, good writing is compared to fine food because _________.A. both writers and cooks have to work long hours every dayB. both are essential to lifeC. both writers and cooks can earn a good livingD. both are enjoyable57. A public "scribe" (Para.2) is_________.A. a secretary who does your business or social writingB. a machine that does writing for youC. a public school where writing is taughtD. a person who earns a living by writing for others58. According to the passage, some managers don ' t have to do any letter writing because ______.A. they rely on quick notesB. they have excellent secretariesC. they have a computer to do itD. they prefer making phone calls59. According to the author, if your letter is thrown into some "letters-to-be-read" file, _______.A. it will receive immediate attentionB. it will be dealt with by the secretaryC. it is likely to be neglectedD. it is meant to be delivered soon60. The purpose of the author in writing this passage is _________.A. to explain and persuadeB. to comment and criticizeC. to interest and entertain B. to argue and demonstratePassage 3Questions 61 to 65 are based on the following passage:In the United States, 30 percent of the adult population has a "weight problem". To many people, the cause is obvious: they eat too much. But scientific evidence does little to support this idea. Going back to the America of the 1910s, we find that people were thinner than today, yet they ate more food. In those days people worked harder physically, walked more, used machines much less and didn't watch television.Several modem studies, moreover, have shown that fatter people do not eat more on the average than thinner people. In fact, some investigations, such as the 1979 study of 3, 545 London office workers, report that, on balance, fat people eat less than slimmer people.Studies show that slim people are more active than fat people. A study by a research group at Stanford University School of Medicine found the following interesting facts:The more the men ran, the more body fat they lost.The more they ran, the greater amount of food they ate.Thus, those who ran the most ate the most, yet lost the greatest amount of body fat.61. The physical problem that many adult Americans have is that__________.A. they are too slimB. they work too hardC. they are too fatD. they lose too much body fat62. According to the article, given 500 adult Americans, __________ people will have a "weight problem".A. 30B. 50C. 100D. 15063. Is there any scientific evidence to support that eating too much is the cause of a "weight problem"?A. Yes, there is plenty of evidence.B. Of course, there is some evidence to show this is true.C. There is hardly any scientific evidence to support this.D. We don't know because the information is not given.64. In comparison with the adult American population today, the Americans of the 1910s __________.A. ate more food and had more physical activitiesB. ate less food but had more activitiesC. ate less food and had less physical exerciseD. had more weight problems65. Modern scientific researches have reported to us that__________.A. fat people eat less food and are less activeB. fat people eat more food than slim people and are more activeC. fat people eat more food than slim people but are less activeD. thin people run less, but have greater increase in food intakePassage 4Questions 66 to 70 are based on the following passage:How can we get rid of garbage? Do we have enough energy sources to meet our future energy needs?These are two important questions that many people are asking today. Some people think that man might be able to solve both problems at the same time. They suggest using garbage as an energy source, and at the time it can save the land to hold garbage.For a long time, people buried garbage or dumped it on empty land. Now, empty land is scarce. But more and more garbage is produced each year. However, garbage can be a good fuel to use. The things in garbage do not look like coal, petroleum, or natural gas; but they are chemically similar to these fossil fuels. As we use up our fossil-fuel supplies, we might be able to use garbage as an energy source.Burning garbage is not a new idea. Some cities in Europe and the United States have been burning garbage for years. The heat that is produced by burning garbage is used to boil water. The steam that is produced is used to make electricity or to heat nearby buildings. In Paris, France, some power plants burn almost 2 million metric tons of the cities garbage each year. The amount of energy produced is about the same as would be produced by burning almost a half million barrels of oil.Our fossil fuel supplies are limited. Burning garbage might be one kind of energy source that we can use to help meet our energy needs. This method could also reduce the amount if garbage piling up on the earth.66. What two problems can man solve by burning garbage?A. The shortage of energy and air pollution.B. The shortage of energy and the land to hold garbage.C. Air pollution and the shortage of fossil fuel.D. Air pollution and the shortage of land to hold garbage.67. Which of the following is NOT the result of burning garbage?A. The garbage burned is turned into fossil fuels.B. The heat produced is used to boil water.C. The steam produced is used to make electricityD. The steam produced is used to heat buildings.68. According to the passage, which of the following is NOT true?A. About 2 million metric tons of garbage is burned in France each year.B. In a modern society, more and more garbage is produced each year.C. Using garbage is a good way to solve the problem of energy shortage.D. It will be too expensive to use garbage as an energy source.69. What is the author’s attitude?A. DelightedB. SadC. AgreeingD. Disagreeing70. The best title for the passage may be ______.A. Garbage and the EarthB. Fossil Fuel and GarbageC. Land and GarbageD. Garbage ? Energy SourcePart IV. Translation (15 points)Directions: Translate the following passage into Chinese on your Answer Sheet.The common cold and the flu are both caused by viruses. More than 200 viruses can cause cold symptoms, while the flu is caused by three viruses - flu A, B and C. There is no cure for either illness, but the flu can be prevented by the flu vaccine, which is, for most people, the best way to fight the flu.But if the flu does strike, quick action can help. Although the flu and common cold have many similarities, there are some obvious signs to look for.Cold symptoms such as stuffy nose, runny nose and scratchy throat typically develop gradually, and adults and teens often do not get a fever. On the other hand, fever is one of the characteristic features of the flu for all ages. And in general, flu symptoms including fever and chills, sore throat and body aches come on suddenly and are more severe than cold symptomsPart V. Writing (15 points)Directions: Write an article of no less than 150 words on the following topic.Lifelong LearningOutline:1.2.3.。