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1、国开04008-理工英语4-任务3-辅导材料以及最新国家开放大学电大传感器与测试技术期末题库及答案国开04008-理工英语4-任务3参考答案说明：假设课程标题是随机的，请按CTRL+F在题库中逐一搜索每一道题的答案特别说明请细心：课程的标题每学期都可能更换，因而请细心核对是不是您需要的标题再下载！标题1：What advice would you give to a friend who wants cosmetic surgery?.: I would advise themnot to have that surgery, becausethey are very well.; Iwoul
2、d tell them that there are many risks and much cost of thatsurgery.; Ihave nothing to give to my friends.参考答案：Iwould tell them that there are many risks and much cost of thatsurgery.标题2：It is hard for any woman to resist _ herself more beauty.: make; made; making参考答案：making标题3：You will get your cosm
3、eticsurgery on your nose.Please tell me if you like this medical plan _.: or not; do you; OK参考答案：or not标题4：Is it better to be physically attractive or intelligent?.: Yes, it is very attractive.; No, it is not attractive.; For me, be intelligent is better, but that depends on.参考答案：For me, be intellig
4、ent is better, but that depends on.标题5： I have a scar on my face, so Ivemake up my mind to have a plastic surgery.: Good idea.; Ive no idea.; Amazing.参考答案：Good idea.标题6：二、阅读理解：阅读下面的短文，按照文章内容进展推断，正确写T“错误写F“。PASSAGE 1(教材课文原文)With a teeny waist, exaggerated breasts, icy-blue eyes, 21-year-old Valeria s
5、ays she is the realnatural deal. A real-life Barbie, that is.Thats what she claims anyway, but many people doubt to her claims. Whether she underwentplastic surgery or uses Photoshop remains unclear. On her blog, the model notes that she is themost famous woman on the Russian Internet because of her
6、 doll-like appeal. Hundreds of photoson her Facebook page show a wide-eyed, nearly fake-looking Valeria posing in a variety ofoutfits.The model did not return requests for comment. If Photoshop is not a factor in getting Valerias look, she likely underwent a barrage of plastic surgery. The president
7、 of American Society of Plastic Surgeons （ASPS）said, plastic surgery should never be usedto transform oneself intoa favorite celebrity or, in this case, a play toy. He also warns patients to keep in mindthatplastic surgery is real surgery with real risks, just as with any operation, so the decision
8、shouldnot be taken lightly.1. Valeria thinks thatshe is areal-life Barbie.T; F2. Valeriaused to accept plastic surgery.T; F3. Valeria writes that she is the most famous woman on the Russian Internet becauseshe postsa lot of pictures on her blog.T; F4. The author thinksValeria neitherPhotoshops her,
9、nor accepts a seriesof plastic surgery.T; F5. The president of ASPS thinks that plastic surgery is of risks.T; F参考答案：子征询题1：T; 子征询题 2：F; 子征询题 3：F; 子征询题 4：F; 子征询题 5：T标题7： Would you have cosmetic surgery if it was free?.: No. Good diet and exercisearegreat alternatives.; Yes, Iwould not have it.; No,I
10、wouldhave it.参考答案：No. Good diet and exercisearegreat alternatives.标题8：Whats _issue here is the difference between cosmetic and plastic surgery.: at; on; in参考答案：at标题9：Cosmetic surgeryinvolves _ reshaping the body features.: in; at; on参考答案：in标题10：Do you think cosmetic surgery is more popular with wome
11、n?.: Yes, women are more popular than men.; No, men are popular than women.; Yes，absolutely. Becausewomen pay more attention to beauty.参考答案：Yes，absolutely. Becausewomen pay more attention to beauty.标题11：二、阅读理解：阅读下面的对话，选择适宜的内容将对话补充完好。HENRY:Good afternoon!Lucy, I am telling yousomething urgent.We have
12、 foundseveral cases of golden staph infectedin our patients. They werecaused byyour products.LUCY: Are you sure? Our bandages are very safe.A; B; C; D; E.HENRY: I knowthat. Butonly patients who have used yourbandages are infected.LUCY: All of our products weremade with theutmostcare.A; B; C; D; E. A
13、nd why didnt you put the bandages into the sterilizer before you usedthem?HENRY: Lucy,A; B; C; D; E. Ive already askedthe hospitalto doa re-examination of your supplies rightnow.LUCY: Henry, youremaking things difficult.HENRY: The safety of our patientsismost important,A; B; C; D; E.LUCY: But I have
14、 already postedyour recent order. They are nowon the way.HENRY: Sorry, Lucy.As soon as theyarrive,A; B; C; D; E.A. May be they were polluted in your hospital.B. so I will stop all orders with your company.C. This is the first time weve received a complaint of this nature.D. they will be returned to
15、your factory immediately.E. its your job to do that, not ours.参考答案：子征询题1：C; 子征询题 2：A; 子征询题 3：E; 子征询题 4：B; 子征询题 5：E标题12：The plastic surgeonmay provide several plansfor your facial _: reconstructed; reconstruction; reconstruct参考答案：reconstruction标题13：Doctor，please let meknow _ youcan reconstruct my fac
16、e.: what; whether; which参考答案：whether标题14：It is known to all that a lot of South Korean _ accepted plastic surgery.: celebrations; celebrates; celebrities参考答案：celebrities标题15：Although plastic surgeryis created to improve the looks of aperson, there are a certain percentage of_.: effect; results; cons
17、equences参考答案：consequences标题16：二、阅读理解：阅读下面的短文，按照文章内容从A、B、C三个选项中选出一个最正确选项。（课外材料）I am very happy to sharemy story about breastenlargement in Thailand. Anyone who is not sure about breast enlargementshould read this story first.Firstly, I was amazed at the level of care I received at the Thailand privat
18、e hospital. It was like being in a luxury hotel. The nursing staffs were also better than those whoI have ever metin all my yearsin America. Not only were they professional, but kinder and more patientthan Western nurses.The hospital food was excellent, so I was able to choose from a large and varie
19、d Menu. In my private room, there was cable T. V., a fridge, aphone, and impressiveviews of Bangkok(曼谷). My Translator was able to communicate with me, and the plastic surgeons arrangedthe whole operation without me lifting a finger.The operation cost me a third of the price ofthe U. K. With thelow
20、cost of the air ticketsand a holiday, it worked out at about half UKs price, because the cost in Thailand is so cheap.Combining a plastic surgerywith a holiday in an amazing placeis anunforgettable experience. From the moment Iarrived in Bangkok airport,Ifelt relaxed and welcomed by the Plastic Surg
21、ery Holiday team, it made me feel thatI had friends here already.1. Where did the author have her breast-enlargementoperation?A; B; CA. In Thailand.B. In America.C. In U. K.2. Was the authorsatisfied with the nursing staffs for her?A; B; CA. No, because they were no better than Americanurses.B. Yes,
22、 because they were more patient than Western nurses.C. No, becausethe care was very poor.3. Which of the following statement is TRUE?A; B; CA. The author was content with the food in the hospital.B. When the author was in the hospital, she lived in a public room.C. There was cable T. V., a bridgeand
23、 a phonein the authors room.4. What does the underlined phraselifting a fingermean in paragraph three?A; B; CA. Doing something with only one finger.B. Helping with something.C. Carrying something.5. Why did the author think her experienceunforgettable?A; B; CA. Because she had an operation there.B.
24、 Because she was satisfiedwith everything there.C. Because she was satisfied withthe service and price there.参考答案：子征询题1：A; 子征询题 2：B; 子征询题 3：A; 子征询题 4：B; 子征询题 5：C标题17：I was a little scared that it was my first time that I_ had my cosmetic surgery.: /; had; was参考答案：had标题18：Do you think cosmetic surger
25、y is more popular with women?.: Yes，absolutely. Becausewomen pay more attention to beauty.; No, men are popular than women.; Yes, women are more popular than men.参考答案：Yes，absolutely. Becausewomen pay more attention to beauty.标题19：Do you think cosmetic surgery is more popular with women?.: Yes，absolu
26、tely. Becausewomen pay more attention to beauty.; Yes, women are more popular than men.; No, men are popular than women.参考答案：Yes，absolutely. Becausewomen pay more attention to beauty.标题20：It is known to all that a lot of South Korean _ accepted plastic surgery.: celebrates; celebrations; celebrities
27、参考答案：celebrities标题21：Do you think cosmetic surgery is more popular with women?.: No, men are popular than women.; Yes, women are more popular than men.; Yes，absolutely. Becausewomen pay more attention to beauty.参考答案：Yes，absolutely. Becausewomen pay more attention to beauty.标题22：It is known to all th
28、at a lot of South Korean _ accepted plastic surgery.: celebrities; celebrations; celebrates参考答案：celebrities标题23：二、阅读理解：阅读下面的短文，选择适宜的内容将短文补充完好。A. In case of any clarificationsB. During the three months probation period with our companyC. which indicates the cost to companyand other benefitsD. Congrat
29、ulations on your continuous success.E. We are happy to inform you that you have been confirmed to the position of sales manager at our company1th, May2016Room 3544London StreetVancouver,424495Dear Mrs. Sue Read,A; B; C; D; E.Your salary has been revised to $1, 000 per month with effect from the conf
30、irmation dateA; B; C; D; E.A; B; C; D; E, we have reviewed your performance and are pleased with your performance. You have achieved all your targets and finished all your work in time.A; B; C; D; E, please reach the generalmanager. His telephone number is+86-10-42823957. E-mail: billsalessmithgroup
31、.A; B; C; D; E.Regards,BillSmith参考答案：子征询题1：E; 子征询题 2：C; 子征询题 3：B; 子征询题 4：A; 子征询题 5：D标题24：Do you think cosmetic surgery is more popular with women?.: No, men are popular than women.; Yes，absolutely. Becausewomen pay more attention to beauty.; Yes, women are more popular than men.参考答案：Yes，absolutely.
32、Becausewomen pay more attention to beauty.标题25：Iaccepted my nose surgery, the _ and patientdoctor was really helpful during my recovery period.: graceful; greedy; gracious参考答案：gracious标题26：Do you think cosmetic surgery is more popular with women?.: Yes, women are more popular than men.; Yes，absolute
33、ly. Becausewomen pay more attention to beauty.; No, men are popular than women.参考答案：Yes，absolutely. Becausewomen pay more attention to beauty.最新国家开放大学电大传感器与测试技术期末题库及答案考试说明：本人针对该科精心汇总了历年题库及答案，构成一个完好的题库，同时每年都在更新。该题库对考生的复习、作业和考试起着特别重要的作用，会给您节约大量的时间。做考题时，利用本文档中的查找工具，把考题中的关键字输到查找工具的查找内容框内，就可迅速查找到该题答案。本文库
34、还有其他网核及教学考一体化答案，敬请查看。传感器与测试技术题库及答案一一、简答题(每题6分。共24分)1静特性：2线性度：3涡流效应：4磁电式传感器有何优点?二、选择题(每空3分，共30分)1将电容量转换成电量的电路称作电容式传感器的转换电路，它们的品种特别多，目前较常采纳的有( )、调频电路、脉冲调宽电路和运算放大器式电路等。A滤波电路 B差动电路C屏蔽电路 D电桥电路2传感器的动态特性是指传感器对随时间变化的输入量的响应特性。动态特性好的传感器，( )。A其测量的绝对误差与仪表的满量程之比小B其输出量随时间变化的曲线与被测量随时间变化的曲线一致或者相近C其输出量中与被测输入量无关的不需要的
35、变化小D其动态数学模型能够用线性常系数微分方程来表示3当声波传播至两介质的分界面，一部分能重返回原介质，称为反射波；另一部分能量透过介质面，到另一介质内接着传播，称为( )。A驻波 B兰姆波 C折射波 D波型转换4为了消除应变片的温度误差，可采纳的温度补偿措施包括：单丝自补偿法、( )和桥路补偿法。A双丝自补偿法 B温度补偿法C电流补偿法 D电压补偿法5超声波的频率高(可达l09Hz)，因而( )，绕射现象小，方向性好，能够成为射线而定向传播。A速度快 B波长短C波长长 D速度慢6在一样的电压和一样幅值的光强度下，当入射光以不同的正弦交变频率调制时，光敏元件输出的光电流J和灵敏度S随调制频率厂
36、变化的关系：称为( )。A频率特性 B光照特性 C光谱特性 D伏安特性7当超声波在一种介质中传播到界面或遇到另一种介质，其方向不垂直于界面时，将产生声波的反射、折射及( )现象。A外表波 B兰姆波C驻波 D波型转换8当光敏元件加一定电压时，光电流J与光敏元件上光照度E之间的关系，称为( )。A温度特性 B光照特性C光谱特性 D伏安特性9压电材料开场丧失压电特性时的温度叫( )。A压电系数 B弹性系数C机电耦合系数 D居里点10粘贴应变片做好预备工作后要进展如下工作( )。A涂胶一贴片一复查一接线一防护 B涂胶一接线一复查一贴片一防护C涂胶一防护一贴片一复查一接线 D涂胶一接线一贴片一复查一防护
37、三、综合题(共46分)1如以下列图构造可用于转速测量，由导磁材料制成的齿轮安装在被测转轴上，与转轴一起旋转。简述其工作原理。(12分)2用涡流传感器测量金属板厚度时是否需要恒温，为什么?(10分)3如以下列图是带有等位环的平板电容器构造原理图，请介绍等位环的作用。(10分)4两金属应变片和阻值均为l20，灵敏系数k=2；两应变片一受拉，另一受压，应变均为1000。两者接人直流电桥组成半桥双臂工作电桥，电源电压U=5V。(14分)求： (1)R和RR；(2)电桥的输出电压U试题答案及评分标准(供参考)一、简答题(每题6分。共24分)1静特性：指传感器在输入量的各个值处于稳定状态时的输出与输人关系
38、，即当输入量是常量或变化极慢时，输出与输入的关系。2线性度：实际测试获得静特性曲线后，采纳直线拟合的方法来线性化，输出输入的校正曲线与其拟合直线之间的最大偏向，就称为非线性误差或线性度。3涡流效应：当一块金属导体放置在一变化的磁场中，导体内就会产生感应电流，这种电流像水中旋涡那样在导体内转圈，因而称之为电涡流或涡流。这种现象就称为涡流效应。 4磁电式传感器有何优点?磁电式传感器直截了当从被测物体吸收机械能并转换成电信号输出，输出功率大，功能稳定，工作不需要电源，调整电路简单，灵敏度较高，一般不需要高增益放大器。二、选择题(每空3分。共30分)1D 2B 3C 4A 5B6A 7D 8B 9D
39、l0A三、综合题(共46分)1如以下列图构造可用于转速测量，由导磁材料制成的齿轮安装在被测转轴上，与转轴一起旋转。简述其工作原理。(12分)答案要点：(1)如以下列图是一种开磁路变磁通式传感器的构造，齿轮安装在被测转轴上，与转轴一起旋转。当齿轮转动时，每转过一个齿，磁路的磁阻就变化一次，因而磁通量也变化一次，线圈中产生感应电动势。(6分)(2)线圈中产生的感应电动势的变化频率等于齿轮的齿数和转速的乘积，由此可测得转轴的转速。(6分)2用涡流传感器测量金属板厚度时是否需要恒温，为什么?(10分)答案要点：(1)导体的电阻率p随温度变化，在较小的温度范围内导体的电阻率D与温度关系为线性关系。(4分
40、)(2)在其他条件不变的情况下，导体电阻率的改变可导致涡流传感器输出信号的变化，引起测量误差，因而用涡流传感器测量金属板厚度时需要恒温。(6分)3如以下列图是带有等位环的平板电容器构造原理图，请介绍等位环的作用。(10分)答案要点：使电极2的边缘电力线平直，两电极间的电场根本均匀，消除和减小边缘效应，提高电容传感器的灵敏度和线性度。4两金属应变片R。和R。阻值均为12012，灵敏系数忌一2；两应变片一受拉，另一受压，应变均为1000z。两者接人直流电桥组成半桥双臂工作电桥，电源电压U一5V。(14分)求：(1)(2)电桥的输出电压答案要点：灵敏系数那么传感器与测试技术题库及答案二一、填空题(1
41、0分。每空l分)1干扰的来源有、和供电系统干扰2PID调理器由、和三部分组成。3集成运算放大器单元电路包括：输入级、和四部分。4直流电动机由定子和两大部分组成，在它们之间是二、选择题(20分，每题2分)1集成稳压器7808的输出电压为( )。A8V B一8V C12V D79V2317为( )集成稳压器。A三端可调正电压输出 B固定型正电压输出C固定型负电压输出 D三端可调负电压输出3假设希望电压比拟器在输入小于+5V时输出电压为高电平，而在输入大于+5V时输出电压为低电平。那么应选用( )。A反相端输入差动电平检测器 B过零比拟器C窗口比拟器 D回差电压比拟器4模仿电压比拟器同运算放大器的主
42、要区别是：模仿电压比拟器中的工作于( )。A开环状态 B负反响状态C深度负反响状态 D高电平状态5单向晶闸管有三个引脚：A、K和G，其中K为( )。A阳极 B阴极C操纵极 D门级6( )构成的H桥电路，上下桥臂不会发生同时导通现象。A全部采纳NPN型晶体管B采纳NPN和PNP型晶体管射极跟随器C采纳PNP和NPN型晶体管集电极跟随器D全部采纳PNP型晶体管7运算放大器中的( )单元用于设置各级放大电路的静态工作点。A输入级 B输出级C中间级 D偏置电路8具有制动作用的不可逆PWM变换器中，所谓制动是指( )。A电动机的电磁转矩和速度方向相反 B电动机做加速运动C电动机做减速运动 D电动机驱动负
43、载转矩匀速运转9L292是一种( )芯片。A转速电压变换器 B步进电机环形分配器C细分电路 D功率驱动芯片10LM3524实际上是一个( )变换器。A脉冲电压 B电压速度C电压电流 D电压脉冲三、简答题(20分。每题5分)1推导图l所示电路中iL的表达式。2三相步进电机的工作方式有哪几种?其中单“、双“、拍“各是什么意思?3单向晶闸管的关断条件是什么?4就硬件方面讲，产生SPWM操纵信号的方法主要有哪几种?四、分析计算题(35分)1写出图2的传递函数。(13分)2分析图3所示无制动作用的不可逆PWM变换器电路在负载电流较大时的电压、电流波形，电流流通途径，以及晶体管和二极管的导通情况。(11分)3请说明图4所示电路的工作原理，图中的各元件的作用是什么?(11分)五、(15分)用7805设计62V电源。试题答案及评分