西安交通大学18年9月课程考试《数字电子技术》作业考核-答案
数字电子技术试卷试题答案汇总(完整版)
数字电子技术基础试卷试题答案汇总一、填空题（每空1分，共20分）1、逻辑代数中3种基本运算是 ， ， 。
2、逻辑代数中三个基本运算规则 ， ， 。
3、逻辑函数的化简有 ， 两种方法。
4、A+B+C= 。
5、TTL 及非门的u I ≤U OFF 时，及非门 ，输出 ，u I ≥U ON 时，及非门 ，输出 。
6、组合逻辑电路没有 功能。
7、竞争冒险的判断方法 ， 。
8、触发器它有 稳态。
主从RS 触发器的特性方程 ， 主从JK 触发器的特性方程 ，D 触发器的特性方程 。
二、 选择题（每题1分，共10分）1、相同为“0”不同为“1”它的逻辑关系是 （ ） A 、或逻辑 B 、及逻辑 C 、异或逻辑2、Y （A ，B ，C ，）=∑m （0，1，2，3）逻辑函数的化简式 （ ） A 、Y=AB+BC+ABC B 、Y=A+B C 、Y=A3、 A 、Y=AB B 、Y 处于悬浮状态 C 、Y=B A +4、下列图中的逻辑关系正确的是 （ ） A.Y=B A + B.Y=B A + C.Y=AB5、下列说法正确的是 （ ） A 、主从JK 触发器没有空翻现象 B 、JK 之间有约束 C 、主从JK 触发器的特性方程是CP 上升沿有效。
6、下列说法正确的是 （ ）A 、同步触发器没有空翻现象B 、同步触发器能用于组成计数器、移位寄存器。
C 、同步触发器不能用于组成计数器、移位寄存器。
7、下列说法是正确的是 （ ）A 、异步计数器的计数脉冲只加到部分触发器上B 、异步计数器的计数脉冲同时加到所有触发器上 C 、异步计数器不需要计数脉冲的控制8、下列说法是正确的是 （ ）A 、施密特触发器的回差电压ΔU=U T+-U T-B 、施密特触发器的回差电压越大，电路的抗干扰能力越弱 C 、施密特触发器的回差电压越小，电路的抗干扰能力越强9、下列说法正确的是（）A、多谐振荡器有两个稳态B、多谐振荡器有一个稳态和一个暂稳态C、多谐振荡器有两个暂稳态10、下列说法正确的是（）A、555定时器在工作时清零端应接高电平B、555定时器在工作时清零端应接低电平C、555定时器没有清零端三、判断题（每题1分，共10分）1、A+AB=A+B （）2、当输入9个信号时，需要3位的二进制代码输出。
zq 西安交通大学18年9月课程考试《药物信息学(高起专)》作业考核试题1
西安交通大学18年9月课程考试《药物信息学（高起专）》作业考核试题-0001 试卷总分:100 得分:0一、单选题 (共 30 道试题,共 60 分)1.下列哪项属于文献的外表特征A.著者B.主题词C.文摘D.分类号正确答案:A2.IM指的是A.医学索引B.化学文摘C.医学文摘D.国际药学文献正确答案:A3.下列选项中不是光盘检索系统的特点是A.检索速度好B.稳定性好C.检索费用低廉D.更新快正确答案:D4.通过哪个检索途径可以检索某个学科有哪些相关的刊物（）A.主题途径B.期刊检索C.基本检索D.作者检索正确答案:B5.检索语言可分为A.规范化语言和受控语言B.规范化语言和非自然语言C.非规范化语言和非受控语言D.规范化语言和非规范化语言正确答案:D6.在CBMdisc检索中，要检索“蔡挺”发表的文献，以下检索式正确的是A.Cai-T in AUB.蔡挺 in AUC.AU：蔡挺D.AU=蔡挺正确答案:D7.国内第一个综合性中文医学文献光盘数据库是A.《中文科技资料目录》（医药卫生）B.《中国医学文摘.护理学》C.《中文科技资料目录》（中草药）D.CBMDISC正确答案:D8.检索“阿斯匹林治疗心肌梗死”的文献，阿斯匹林应组配副主题词A.theraputic useB.Drug TherapyC.TherapyD.Diagnosis正确答案:A9.1953年新中国颁布的第一部药品标准法典是A.《中华药典》B.《关于严禁鸦片烟毒的通令》C.《中华人民共和国药典》D.《中华人民共和国药品管理法》正确答案:C10.以下描述错误的是（）A.以信息角度看，合理用药实质上是一个在病人、医药工作者和药品之间的信息运动过程。
B.药品信息若完整、充分地从药师传递给病人，则不会导致病人服药错误C.药学信息组织的目的可以概括为“实现无序药学信息向有序药学信息的转换”。
D.和手工检索方式相比，计算机检索速度快，信息量大，时效性强。
西安交通大学18年9月课程考试CAD-CAM作业考核试题【100分答案】
西安交通大学18年9月课程考试《CAD-CAM》作业考核试题
1、A
2、C
3、D
4、C
5、A
一、单选题共30题，60分
1、在CAD作业中，采用数据文件形式来处理工程数表、线图数据，其目的是（）A减少占用内存，使数据文件独立于计算程序
B减少占用内存，使数据文件与计算程序融为一体
C占用大量内存，较好解决数据共享
D占用外存，使数据文件与操作系统紧密结合
参考答案是：A
2、应用软件是在操作系统、( )基础上针对某一专门的应用领域而研制的软件。
ACAD软件
BCAM软件
C支撑软件
D编译系统
参考答案是：C
3、以下与CAD/CAM无关的概念和技术是( )
A并行工程
B精益生产
C敏捷制造
DCAI
参考答案是：D
4、在CAD/CAM系统中，()是连接CAD、CAM的纽带。
ACAE
BCAG
CCAPP
DCAQ
参考答案是：C
5、关于MRPⅡ,下列描述中错误的是( )
AMRPⅡ是一种与MRP完全不同的新技术
BMRPⅡ在内容和能力上有了很大扩充,涵盖了企业整个生产经营活动
CMRPⅡ集成了生产、财务、销售、工程技求、采购等各个子系统
DMRPⅡ系统的核心部分是物料需求计划
参考答案是：A。
[答案]西安交通大学18年9月课程考试《英语2(新录)》作业考核试题(含主观题)
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西安交通大学18年9月课程考试《英语2（新录）》作业考核试题（含主观题）试卷总分:100 得分:100一、单选题 (共 20 道试题,共 40 分)第1题,I had great difficulty _________ the suitable food on the menu in that restaurant.A、findB、foundC、to findD、finding正确答案:D第2题,The new gym is _________ as the old one.A、three times as largeB、three times the sizeC、three times larger thanD、as three times large正确答案:A第3题,—I can’t get on well with some of my classmates. They just leave me in the cold. —________. But what’s the reason?A、Sorry to hear that.B、How about that?C、Don’t mention it.D、Never give up!正确答案:A第4题,—Dad, I won first place in the speech contest.—______! I’m proud of you, my daughter.A、CongratulationsB、Good luckC、My pleasureD、Good idea正确答案:A第5题,Is there _____ in today’s paper?A、important somethingB、important anythingC、something importantD、anything important正确答案:D第6题,—What do you want to do next? We have half an hour until the basketball game. — ______. Whatever you want to do is fine with me.A、It just dependsB、It’s up to youC、All rightD、Glad to hear that正确答案:B第7题,You can’t imagine how my sister finished the relay race ________ her left foot wounded so much.A、thatB、forC、withD、while正确答案:C第8题,The Browns _______ the trains; if not, they would have been at the get-together as scheduled.A、must missB、must have missedC、should missD、should have missed正确答案:B第9题,— Your spoken English is so good. Have you been abroad?— Yes. I ________ in London for two years.A、have stayedB、stayedC、had stayedD、have been staying正确答案:A第10题,—Have you been wasting time on computer games again?—________. I’ve been studying a lot and I need a break.A、No wayB、I don’t agreeD、I couldn’t agree more正确答案:C第11题,China’s space station, ________ three capsules and cov ering an area of no less than 60 square meters, will be completed within 10 years.A、making up ofB、made upC、consisted ofD、consisting of正确答案第12题,— How do you find the concert in the Beijing Grand Theatre last night? —______. But the conductor was perfect.A、I couldn’t agree moreB、I don’t think much of itC、I was crazy about itD、I really like it正确答案:B第13题,The discovery of new evidence led to _________.A、the thief having caughtB、catch the thiefC、the thief to be caughtD、the thief being caught正确答案:D第14题,Mr. White _____ at 8:30 for the meeting, but he didn’t turn up.A、should have arrivedB、should arriveC、should have had arrivedD、should be arriving正确答案:A第15题,—Excuse me, could you tell me the way to the British Museum?—Sorry, I’m a stranger here.— ______.A、Thanks anywayB、It doesn’t matterC、Never mind正确答案:A第16题,— Thank you very much for helping me when I was in trouble.— _____.A、Don’t mention itB、With pleasureC、That’s rightD、You said it正确答案:B第17题,The guide was enthusiastic and knowledgeable and we spent a lovely evening wandering into places which we ________ straight past otherwise.A、had walkedB、were walkingC、would have walkedD、must have walked正确答案:C第18题,—The weather here in summer is so changeable. Please take an umbrella when you go out. — ________.A、Well, don’t worryB、Well, it just dependsC、Oh, take it easyD、OK, just in case正确答案:D第19题,— Have a nice weekend.— Thank you. _____.A、See you laterB、What about youC、The same to youD、It’s my pleas ure正确答案:C第20题,Had it not been for the haze(雾霾) weather phenomenon, there _____ fewer car accidents in Beijing then.A、wereB、would beC、may beD、would have been正确答案:D二、阅读理解 (共 3 道试题,共 30 分)1.Psychologists have discovered that even the most independent-minded of us will conform to social pressure when we are with a group of people. In one classic experiment, people were shown a vertical line and asked to find a line of identical length from a selection of three. You might think that this is an absurdly easy task, and when people perform it by themselves they do it very well. However, psychologists have discovered that we are very easily swayed by the opinions of other people when we do this task in a group. In one study, a group of three people was set up, where two of the people were confederates (同伙) of the experimenter. When the confederates deliberately gave wrong answers, people were often swayed to give the wrong answer also. In fact, 75% of people gave at least one wrong answer, with some people conforming to peer pressure on every occasion. But why do people conform in this way? In an easy task like this, it seems that people do not want to step out of line with the prevailing opinion of the group. On more difficult tasks, people also conform because they lose confidence in their own ability to make decisions and prefer to trust the majority opinion instead. A typical example of this kind of conformity arises when we come across people in distress. Would you help a woman who has been attacked in the street? It turns out that you are much more likely to go to her assistance if you are alone. When other people are also around, a diffusion of responsibility occurs. People are paralysed into inaction, because everyone assumes that someone else will go to the woman’s assistance.(1).In Paragraph 1, the underlined word "conform" probably means “________”.A.seek independenceB.disobey ordersC.seek pleasureD.follow what others do(2).What is the purpose of the experiment described in Paragraph 2? To ________.A.explain why people would be influenced by the opinions of othersB.prove that people are easily influenced by the opinions of othersC.train the confederates of the experimenter as independent-mindedD.describe how people would be influenced by the opinions of others(3).In the last paragraph, according to the author, why wouldn’t one help the woman? He ________.A.thinks he has no responsibilities to give a handB.thinks he has nothing to do with itC.is too shy to give his helping handD.thinks someone else will offer assistance(4).What method does the author mainly use to develop the text?A.Giving examples.B.Cause-effect analysis.parative analysis.D.Process analysis.正确答案: (1).D (2).B (3).D (4).A2.Owning a smartphone may not be as smart as you think. It may let you surf the Internet, listen to music and snap photos wherever you are…but it also turns you into a workaholic, it seems. A study suggests that, by giving you access to emails at all times, the all-singing, all-dancing mobile phone adds as much as two hours to your working day. Researchers found that Britons work an additional 460 hours a year on average as they are able to respond to emails on their mobiles. The study by technology retailer Pixmania reveals the average UK working day is between 9 and 10 hours, but a further two hours is spent responding to or sending work emails, or making work calls. More than 90 percent of office workers have email-enabled phones, with a third accessing them more than 20 times a day. Almost one in ten admits spending up to three hours outside their normal working day checking work emails. Some workers confess(承认) they are on call almost 24 hours a day, with nine out of ten saying they make work emails and calls outside their normal working hours. The average time for first checking emails is between 6 a.m. and 7 a.m., with more than a third checking their first emails in this period, and a quarter checking them between 11 p.m. and midnight. Ghadi Hobeika, marketing director of Pixmania, said, “The ability to access literally millions of apps, keep in contact via social networks and take photos and video as well as text and call has made smartphones invaluable for many people. However, there are drawbacks. Many companies expect their employees to be on call 24 hours a day, seven days a week, and smartphones mean that people literally cannot get away from work. The more constantly in contact we become , the more is expected of us ina work capacity(容量).”(1).What can we conclude from the text?A.All that glitters is not gold.B.It never rains but pours.C.Every coin has two sides.D.It’s no good crying over spilt milk.(2).The underlined word “accessing” in the third paragraph can be replaced by “________”.A.callingB.reachingC.gettinging(3).Which of the following is true according to the text?A.The average UK working time is between nine and twelve hours.B.Nine- tenths of workers in UK spent over three hours checking work emails.C.One-fourth of the workers in UK check their first mail between 11 p.m. and midnight.D.The average time for first checking emails is between 6 a.m. and 8. am.(4).What’s the main idea of the text?A.Workaholics like smartphones.B.Smartphones bring about extra work.C.Smartphones make our life easier.D.Employers don’t like smartphones.正确答案: (1).C (2).D (3).C (4).B3.The sharing economy, represented by companies like Airbnb or Uber, is the latest fashion craze. But many supporters have overlooked the reality that this new business model is largely based on escaping regulations and breaking the law. Airbnb is an internet-based service that allows people to rent out spare rooms to strangers for short stays. Uber is an internet taxi service that allows thousands of people to answer ride requests with their own cars. There are hundreds of other such services. The good thing about the sharing economy is that it promotes the use of underused resources. Millions of people have houses or apartments with empty rooms, and Airbnb allows them to profit from these rooms while allowing guests a place to stay at prices that are often far less than those charged by hotels. Uber offers prices that are competitive with standard taxi prices and their drivers are often much quicker and more trustworthy. But the downside of the sharing economy has gotten much less attention. Most cities and states both tax and regulate hotels, and the tourists who stay in hotels are usually an important source of tax income. But many of Airbnb’s customers are not paying the taxes required under the law. Airbnb can also raise issues of safety for its customers and tr ouble for hosts’ neighbors. Hotels are regularly inspected to ensure that they are not fire traps and that they don’t form other risks for visitors. Airbnb hosts face no such inspections. Since Airbnb is allowing people to escape taxes and regulations, the company is simply promoting thefts. Others in the economy will lose by bearing an additional tax burden or being forced to live next to an apartment unit with a never-ending series of noisy visitors. The same story may apply with Uber. Uber is currently in disputes over whether its cars meet the safety and insurance requirements imposed on standard taxis. Also, if Uber and related services flood the market, they could harm all taxi drivers’ ability to earn a minimum wage. This downside of the sharing needs to be taken seriously, but that doesn’t mean the current tax and regulatory structure is perfect.(1).What is the positive thing about the sharing economy?A.It is a global trend.B.It is beyond regulations.C.It draws on spare resources.D.It brings in modest profits.(2).What is the problem with Airbnb customers according to the passage?A.They are not regularly inspected.B.They are likely to commit thefts.C.They are allowed not to pay taxes.D.They can be noisy to hosts’ neighbours.(3).What is the argument over Uber according to the passage?A.Whether it guarantees customers’ safety.B.Whether it provides reliable services.C.Whether it lowers customers’ expenses.D.Whether it can compete with standard taxis.(4).What will be talked about in the following paragraphs?A.Existing regulations and laws.B.More downsides of Airbnb and Uber.C.Further development of Airbnb and Uber.D.Necessary improvements of current laws.正确答案: (1).C (2).D (3).A (4).B三、简答题 (共 3 道试题,共 15 分)1.Only in American can a billionaire carry on like plain folks and get away with it. 正确答案:只有在美国，一个亿万富翁才能像平民百姓一样安稳地过着普普通通的日子，而不致于惹来不必要的麻烦。
西安交通大学18年9月课程考试《高电压技术(高起专)》作业考核试题
(单选题) 1: 波阻抗为Z的线路末端接负载电阻R，且R＝Z，入射电压U0到达末端时，波的折反射系数为（）A: 折射系数α＝1，反射系数β＝0B: 折射系数α＝－1，反射系数β＝1C: 折射系数α＝0，反射系数β＝1D: 折射系数α＝1，反射系数β＝－1正确答案：(单选题) 2: 空载线路合闸的时候，可能产生的最大过电压为（）。
A: 1.5EmB: 2 EmC: 3 EmD: 4 Em正确答案：(单选题) 3: 当避雷器与被保护设备之间有一定距离时，若有雷电波侵入,则在被保护设备绝缘上出现的过电压将比避雷器的残压（）。
A: 低一个ΔU；B: 高一个ΔU；C: 一样大；D: 不一定正确答案：(单选题) 4: 发电机突然甩负荷引起的过电压属于（）。
A: 操作过电压B: 谐振过电压C: 工频过电压D: 暂时过电压正确答案：(单选题) 5: 电晕放电是一种（）。
A: 自持放电B: 非自持放电C: 电弧放电D: 沿面放电正确答案：(单选题) 6: 110kV进线保护段应有的耐雷水平是（）A: 30kAB: 60kAC: 75kAD: 110kA正确答案：(单选题) 7: 冲击系数是（）冲击放电电压与静态放电电压之比。
A: 25%B: 50%C: 75%D: 100%正确答案：(单选题) 8: 多油式断路器中油的用途是（）A: 灭弧介质B: 灭弧介质和绝缘介质C: 绝缘介质D: 导热介质正确答案：(单选题) 9: SF6气体具有较高绝缘强度的主要原因之一是（）。
A: 无色无味性C: 无腐蚀性D: 电负性正确答案：(单选题) 10: 我国国家标准规定的雷电冲击电压标准波形通常可以用符号（）表示。
A: (1.2±30%)μsB: (50±30%)μsC: 1.2/50μsD: (1.2±20%)μs正确答案：(单选题) 11: 工频耐压试验一般要求持续（）的耐压时间。
A: 1 minB: 2 minC: 3 minD: 5 min正确答案：(单选题) 12: 电晕放电是一种（）。
《数字电子技术(高起专)》作业考核试题与答案
西安交通大学16年3月课程考试《数字电子技术（高起专）》作业考核试题一、单选题1. TTL与非门低电平输出电流IOL 的参数规范值是（ D ）。
A. 20μAB. 40μAC. 1.6mAD. 16mA2. 已知F=(ABC+CD)'，选出下列可以肯定使F=0的取值（ D ）。
A. ABC=011B. BC=11C. CD=10D. BCD=1113. 把模拟量转换成为相应数字量的转换器件称为（ D ）。
A. 数-模转换器B. DACC. D/A转换器D. ADC4. “与非”逻辑运算结果为“0”的条件是该与项的变量（ B ）。
A. 全部输入“0”B. 全部输入“1”C. 至少有一个输入“1”D. 任一个输入“0”5. 用三态门可以实现“总线”连接，但其“使能”控制端应为（ D ）。
A. 固定接0B. 固定接1C. 同时使能D. 分时使能6. 高密度可编程逻辑器件中具有硬件加密功能的器件是（ D ）。
A. HDPLD和FPGAB. GALC. HDPLDD. FPGA7. 改变（ D ）之值不会影响555构成单稳态触发器的定时时间tw。
A. 电阻RB. 电容CC. C-U端电位D. 电源VCC8. 如要将一个最大幅度为9.99V的模拟信号转换为数字信号，要求ADC的分辨率小于0mV，最少应选用（ C ）位ADC。
A. 6B. 8C. 10D. 129. 用卡诺图化简具有无关项的逻辑函数时，若用圈1法，在包围圈内的×是按（）处理；在包围圈外的×是按（ B ）处理。
A. 1，1B. 1，0C. 0，0D. 不确定10. 二极管与门的两输入信号AB＝（ D ）时，输出为高电平。
A. 00B. 01C. 10D. 1111. 用不同数制的数字来表示2004，位数最少的是（ A ）。
A. 十六进制B. 十进制C. 八进制D. 二进制12. 若双积分A/D转换器第一次积分时间T取20mS的整倍数，它便具有（ B ）的优点。
西安交通大学17年9月课程考试《计算机应用基础》作业考核试题(含主观题)标准答案
西安交通大学17年9月课程考试《计算机应用基础》作业考核试题（含主观题）一、单选题（共 20 道试题，共 40 分。
）1. 启动幻灯片切换可以通过（）命令。
A. 格式/幻灯片切片B. 幻灯片放映/幻灯片切换C. 插入/幻灯片切换D. 工具/幻灯片切换正确答案：B 满分：2 分2. PowerPoint2003中“文件”菜单中的“保存”命令其快捷键是（）。
A. Ctrl+PB. Ctrl+OC. Ctrl+ND. Ctrl+S正确答案：D 满分：2 分3. 与Internet相连的计算机，不管是大型的还是小型的，都称为( )。
A. 工作站B. 主机C. 服务器D. 客户机正确答案：B 满分：2 分4. Word常用工具栏中的“显示比例”选择框，是用于（）的。
A. 字符缩放B. 字符缩小C. 字符放大D. 上述均不是正确答案：A 满分：2 分5. 在Word中，要插入一些比较复杂的图形，用户可以通过( )来完成。
A. “自选图形”按钮B. “矩形”按钮C. “椭圆”按钮D. “插入艺术字”按钮正确答案：A 满分：2 分6. 多媒体计算机系统的两大组成部分是（）。
A. 多媒体功能卡和多媒体主机B. 多媒体通信软件和多媒体开发工具C. 多媒体输入设备和多媒体输出设备D. 多媒体计算机硬件系统和多媒体计算机软件系统正确答案：D 满分：2 分7. 在IE浏览器访问FTP服务器时，下列地址中属于有效的FTP地址格式的是( )。
A. ftp://B. C. Smtp://D. tcp://正确答案：A 满分：2 分8. 水平标出现在Word文档工作区的（）。
A. 左侧B. 底部C. 右侧D. 顶部正确答案：D 满分：2 分。
西安交通大学18年9月课程考试《电工技术基础》作业考核试题答案
(单选题) 1: 关于欧姆定律，下面的描述正确的是（）。
A: 电压和电流参考方向相关联时有U=IRB: 电压和电流参考方向相非关联时有U=IRC: 电压和电流参考方向相关联时有U=-IRD: 电压和电流参考方向相非关联时有U= IR正确答案: A(单选题) 2: 在电路的基本组成中，能提供电能的是（）。
A: 电源B: 负载C: 连接导线D: 控制装置正确答案: A(单选题) 3: 图示电路原先已处于稳定状态，t=0 时开关S闭合，则iC(0+)=( )。
A: 0AB: 3AC: 2AD: 1A正确答案: D(单选题) 4: 下列设备中，一定是电源的为（）。
A: 电动机B: 冰箱C: 蓄电池D: 白炽灯正确答案: C(单选题) 5: 在理想的RLC并联电路的谐振状态下，若总电流为5mA，则流过电阻的电流为（）。
A: 2.5mAB: 5mAC: 1.6mAD: 50mA正确答案: A(单选题) 6: 图示电路中，已知I1= 2A，I2= -1A，I3= -3A，则I4的大小为( )。
A: 1AB: ?2AC: 3AD: 2A正确答案: D(单选题) 7: 图示电路中，电压U等于( )。
A: 5VB: 10VC: 15VD: 20V正确答案: A(单选题) 8: 在S7-200系列PLC中，常用作初始化的特殊存储器是( )。
A: SM0.0B: SM0.1C: SM0.2D: SM0.3正确答案: B(单选题) 9: 在三相异步电动机的直接启停控制电路中，为了实现启动按钮的自锁，应( )。
A: 把接触器的辅助常闭触点与启动按钮相并联。
B: 把接触器的辅助常开触点与启动按钮相并联。
C: 把接触器的辅助常闭触点与启动按钮相串联。
D: 把接触器的辅助常开触点与启动按钮相串联。
正确答案: B(单选题) 10: .A: AB: BC: CD: D正确答案: A(单选题) 11: 交流铁芯线圈如图所示，保持电源电压U、频率f及线圈匝数N不变，将铁芯a、b段锯开形成气隙，则铁芯中磁通的最大值Φm和线圈电流有效值I的变化情况分别是( )。
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西安交通大学18年9月课程考试《数字电子技术》作业考核试题
1、B
2、A
3、C
4、B
5、B
一、单选题共30题，60分
1、电源电压VDD为0V的CMOS集成模拟开关可接通幅度为（）的信号。
A－10～0V
B0～10V
C0～VDD/2
D＞10V
选择是：B
2、欲在一串幅度不等的脉冲信号中，剔除幅度不够大的脉冲，可用（）电路。
A施密特触发器
B单稳态触发器
C多谐振荡器
D集成定时器
选择是：A
3、数字系统中，降低尖峰电流影响，所采取的措施是（）。
A接入关门电阻
B接入开门电阻
C接入滤波电容
D降低供电电压
选择是：C
4、同步RS触发器的两个输入信号R S为00，要使它的输出从0变成1，它的R S应为A00
B01
C10
D11
选择是：B
5、组合电路分析的结果是要获得
A逻辑电路图
B电路的逻辑功能
C电路的真值表
D逻辑函数式
选择是：B
6、2007个1连续异或的结果是______。
A0
B1
C不唯一
D逻辑概念错误。