[判断题]
低通滤波器是用来通过高频信号，抑制或衰减低频信号的滤波电路。
选项（2分）：
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二蛋说：在有限的条件下，二蛋将尽最大努力提供一个纯净无广告，无安装插件，无病毒，并且直观超级简洁的海量学习题目平台，感谢各位用户的支持！[单选题] This is really an[填空] day to all of us!A be exhausting。 B exhausted。 C exhaust。 D exhausting。 |
[单选题] My hair wants [填空]. I'd better have it done tomorrow.A cutting。 B being cut。 C to cut。 D cut。 |
[单选题] The famous writer wrote many children's books, nearly half of [填空 were published in the 1980s.A which。 B them。 C that。 D what。 |
[单选题] Some animals sleep[填空] the day and wake up[填空]night.A by; by。 B in; at。 C at; in。 D in;by。 |
[单选题] The job would require that[填空] at 8 o'clock every morning.A she will be at the office 。 B she be at the office。 C she was at the office 。 D she has been at the office。 |
[单选题] As the light turned green, the woman stood for a moment, not[填空], and asked herself what she was going to do.A moving。 B to move。 C moved。 D being moved。 |
[单选题] I'm really tired[填空] Jack. He had me [填空] for an hour in the rain.A of, waiting。 B of; waited。 C with; waited。 D with; wait。 |
[单选题] We discovered[填空] we had learned to be valuable.A what。 B which。 C that。 D how。 |
[单选题] 填空] beat Xiao Zhang black and blue is not knownA What。 B Who。 C Whoever。 D Whom。 |
[单选题] His aunt's house in the downtown area is much smaller than his , but it is twice[填空] expensive.A as。 B too。 C very。 D so。 |
[单选题] Were it not for the rainny weather, they [填空] all rightA would be 。 B may be。 C would have been。 D were。 |
[单选题] At college, Barack Obama didn't know that he [填空] the first black president of the United States of America.A was to become。 B became。 C is to become。 D becomes。 |
[单选题] 填空]the manager will be able to come remains a questionA That。 B Whether。 C What。 D When。 |
[单选题] Zhang Hua was the very one of the students who [填空] praised at the class meetingA are。 B is。 C were。 D was。 |
[单选题] —It's very windy and dusty in Beijing. Well, more trees [填空] every year to stop the wind and sand.A should plant。 B should planted。 C can planted。 D must be planted。 |
[单选题] —I drove to Shen Zhen for the consert last week. —Is that |填空 | you had a few days off?A how。 B why。 C what。 D where。 |
[单选题] If the student[填空], she will bring her violin.A comes。 B came。 C come。 D will come。 |
[单选题] His grand parents[填空] in the countryside.A are used to live。 B used to live。 C used to living。 D are used to live。 |
[单选题] After the student was praised for what he had done, he said:"I[填空 even better under harder conditions. ”A had done。 B did。 C would have done。 D would do。 |
[单选题] In the month, the man earned as much as,if [填空] than $50,000A no more。 B no much。 C not more。 D not much。 |
[单选题] As is known to all, pandas are [填空] native to China, that is, China is [填空] home to pandasA ;/。 B /; the。 C the;/。 D the; the。 |
[单选题] Beauty and the Beast is a very nice film .I[填空] it twice.A see。 B saw。 C have seen。 D will see。 |
[单选题] If the weather is fine,we'll go.If[填空],[填空].A no; not。 B not; no。 C no; no。 D not; not。 |
[单选题] No meat for my sister because she's [填空] a diet.A in。 B at。 C with。 D on。 |
[单选题] When[填空] with kindness, the man was very amiable.A was treated。 B treating。 C treat。 D treated。 |
[单选题] He is said [填空]in Shanghai.A to work。 B to be working。 C being working。 D worked。 |
[单选题] At the foot of the mountains [填空].A a village lie。 B does a village lie。 C lying a village。 D lies a。 |
[单选题] They're talking about the piano and the pianist[填空]they were in the concert we attended last night.A which 。 B whom 。 C who 。 D that。 |
[单选题] Tables [填空] of stones or wood.A can made。 B can be made。 C can make。 D made。 |
[单选题] Catherine was born in Beijing but[填空] in Britain, because her parents went there to work for some reason.A taken out。 B brought up。 C taken up。 D brought out。 |
[单选题] E-mailing is much [填空] than long-distance callingA the cheapest。 B cheapest。 C cheaper。 D cheap。 |
[单选题] After[填空]the old man, the doctor suggested that he[填空] a bad coldA examined, catch 。 B examined, had caught。 C examining, had caught。 |
[单选题] The judge insisted that the woman [填空] innocent and that she[填空 ]at once.A was; be set free。 B be; be set free;。 C be; was set free。 D was; was set free。 |
[单选题] The super market doesn't open until 11 a.m.,[填空] it loses a lot of business.A or。 B for。 C so。 D but。 |
[单选题] We will be thankful for [填空] you have done.A hat。 B which。 C what。 D who。 |
[单选题] I don't like Mary at all. She never[填空] her promise.A keeps。 B makes。 C breaks。 D does。 |
[单选题] The basketball match will be put off if it [填空].A snow。 B snowed。 C snows。 D will snow。 |
[单选题] His homework [填空], Jim decided to go and see the play.A doing。 B done。 C did。 D do。 |
[单选题] I have many books, some of [填空] are wtitten by Mark Twain.A hose。 B which。 C that。 D them。 |
[单选题] In some parts of the world, coffee [填空] with milk and sugar.A is serving。 B is served。 C serves。 D served。 |
[单选题] If the man were any younger, he would do [填空] he is interested in.A whomever。 B whatever。 C whoever。 D whichever。 |
[单选题] [填空] the country, the [填空] to migrants it is.A The richest; the most attractive。 B The richer; the most attractive。 C The rich; the more attractive。 D The richer; the more attractive。 |
[单选题] What[填空] her daughter[填空] by the time she was seven?A had; done。 B did;did。 C has; done。 D did;do。 |
[单选题] The service was terrible and [填空] the food.A so as to。 B so was。 C so as。 D so that。 |
[单选题] They need to be more mature and ready to [填空] their mistakes.A hold on to。 B cut off。 C is。 D make up for。 |
[单选题] The reason[填空] Susan hasn't come is[填空] she has to look after her child.A why; that。 B that; because。 C why; since。 D which; because。 |
[判断题] By the time Lily gets home, her mother wi l have left for Bei jing to attend a meeting.正确 、正确。 错误 、错误。 |
[单选题] I t was when Poly took a job in a company [填空]she began to learn English.A that。 B when。 C which。 D where。 |
[单选题] All the mobile phones must [填空] before the meeting starts.A be turning off。 B turn off。 C be turn off。 D be turned off。 |
[单选题] All the coats are sold at half price for the super market[填空].A had closed down。 B has closed down。 C closed down。 D is closing down。 |
[单选题] Mother was worried because little Alice was ill, especially [填空 Father was away in France.A during。 B that。 C as。 D if。 |
[单选题] —Be sure to get up earlier tomorrow morning. [填空],I'll be as early as a bird.A No, I will。 B Of course not 。 C I'm afraid I can。 D OK,I will。 |
[单选题] Although he knew little about the work done in the field of chemistry, he succeeded [填空]other experienced experts failed.A which。 B that。 C what。 D where。 |
[单选题] 填空] were present at the meeting.A Either。 B Every。 C All。 D Each。 |
[单选题] 填空] our teacher suddenly fell ill last week made us surprisedA It。 B That。 C What。 |
[单选题] The boy [填空] in blue is my third son.A dressed。 B is dressed。 C dressed himself。 D dressing。 |
[单选题] The young man begin [填空] Franch eignt years ago .A learning。 B learn。 C learned。 D learnt。 |
[单选题] She couldn't help [填空] when she heard the good newsA laughed。 B laugh。 C laughing。 D to laugh。 |
[单选题] [lis mother was surprised at [填空].A what he is saying。 B what he said。 C what said he。 D what。 |
[单选题] Hearing the footsteps from the stairs, the little boy hurriedly turned off the computer, picked up a book and pretended[填空].A having read。 B to be reading。 C to reading。 D reading。 |
[单选题] The old woman,[填空]so badly, almost lost her memoryA disturbing。 B being disturbed。 C having disturbed。 D having been disturbed。 |
[单选题] I t's the forth time [填空]late this month.A when you've arrived 。 B that you arrived。 C when you arrived。 D that you've arrived。 |
[单选题] They will have a[填空] holiday after the exam.A two-month。 B two month。 C two month's。 D two-months。 |
[单选题] Everybody believed the man [填空] away the diamond ring.A to have taken。 B to take。 C taking。 D be taken。 |
[单选题] To tell[填空]truth, it is [填空]struggle for the actor to get ready in such a short time.A the; really a 。 B the; real a 。 C a; a real。 D a; a really。 |
[单选题] [填空]will go is not important.A Whom 。 B Which。 C Who@That。 |
[单选题] Not[填空] Mary's address and telephone number, we couldn't get in touch with her.A know。 B knowing。 C knew。 D to konw。 |
[单选题] We offered Jonson our congratulations [填空] his passing the college entrance exams.A at。 B of。 C for。 D on。 |
[单选题] Which would you rather have,the [ 填空] chicken or the fish?A maid。 B ideal。 C fried。 D fuel。 |
[单选题] Neither the students nor the professor [填空] anything about it.A knows。 B know。 C is known。 D are knowing。 |
[单选题] The[填空] expression on the student's face suggested that he was not able to work out the[填空] problem.A puzzled; puzzled。 B puzzling; puzzled。 C puzzled; puzzling。 D puzzling; puzzling。 |
[单选题] If they keep on, they'll succeed [填空].A at one time。 B at the same time。 C in time。 D on time。 |
[单选题] All the machines[填空] by the end of the following month.A will be repaired。 B will have repaired。 C will have been repaired。 D have been repaired。 |
[单选题] [填空] student in the class took part in the performanceA Every。 B Both。 C All。 D Each。 |
[单选题] More and more women are signing up for Yoga classes nowadays,[填 空] advantage of the health and relaxation benefits.A having been taken。 B having taken。 C taking。 D taken。 |
[单选题] The Chinese[填空] paper for two thousand yearsA have been made。 B make。 C have made。 D have been。 |
[单选题] Never take [填空]for granted that one can succeed just with luck.A it。 B that。 C one。 D them。 |
[单选题] His mother gave the boy a warning,[填空] he turned a deaf ear.A to which。 B to that。 C for which。 D of which。 |
[判断题]网络传感器使得传感器从被动检测向主动进行信息处理方向发展。 正确 、正确。 错误 、错误。 |
[判断题]常见的人工嗅觉系统一般由气敏传感器阵列和分析处理器构成。 正确 、正确。 错误 、错误。 |
[判断题]机器人触觉传感器只具有识别功能。 正确 、正确。 错误 、错误。 |
[单选题]按照传感器（ ）的方式分为结构型、物性型等。 A 工作原理 。B 工作机理 。C 输出信号 。D 能量转换 。 |
[单选题]量程或测量范围、过载能力等属于（ ）。 A 可靠性指标 。B 输入量的性能指标 。C 静态特性指标 。D 环境要求指标 。 |
[判断题]M7130平面磨床中用来夹紧工件的电磁吸盘，可以牢牢地夹紧非导磁性材料工件（如铜铝）。 正确 、正确。 错误 、错误。 |
[判断题]按照动力机构分类机电控制系统可分为机械式、电气式和流体式。 正确 、正确。 错误 、错误。 |
[判断题]控制器是所有机电控制系统的核心。 正确 、正确。 错误 、错误。 |
[单选题]直流电机中的换向极由( )组成。 A 换向极铁心 。B 换向极绕组 。C 换向器 。D 换向极铁心和换向极绕组 。 |
[判断题]交流接触器是通过线圈产生的磁场使静铁芯产生电磁吸力吸引动铁芯的。 正确 、正确。 错误 、错误。 |
[单选题]直流电动机启动后，其反电动势大小与转子速度（ ）。 A 没有关系 。B 成正比 。C 成反比 。 |
[单选题]直流电动机实际换向器接触片触点远多于原理图的两片结构，其目的是（ ）。 A 美观 。B 增加动力 。C 增加平顺性 。D 提高安全性 。 |
[单选题]以下哪种电器可快速切断交流与直流主回路并可频繁地接通与大电流控制（达800A）电路的装置，所以经常运用于电动机做为控制对象，还具有低电压释放保护作用。 A 按钮 。B 接触器 。C 热继电器 。D 熔断器 。 |
[单选题]串励直流电动机随着负载的增加，其转速将会（ ）。 A 急剧下降 。B 急剧上升 。C 保持不变 。D 缓慢变化 。 |
[单选题]直流电动机启动后，其反电动势会（ ）电源加在线圈上的部分电压。 A 不影响 。B 增强 。C 抵消 。 |
[判断题]工业机器人驱动部分在控制信息作用下提供动力，包括电动、气动、液压等各种类型的传动方式。 正确 、正确。 错误 、错误。 |
[单选题]通过以下哪种方式可以提高步进电机的走步精度（ ）。对于机电一体化系统的涵义，至今还有不同的认识，但对机电一体化的本质特性一般认为是一个（ ）。 A 机械系统 。B 传感系统 。C 计算机系统 。D 电气系统 。 |
[判断题]听觉传感器是机器人中最重要的传感器，出现于20世纪50年代后期。 正确 、正确。 错误 、错误。 |
[判断题]磁电式传感器工作时需要电源。 正确 、正确。 错误 、错误。 |
[判断题]微型传感器是目前最为成功、最具有实用性的微机电系统装置，是一种基于半导体工艺技术的新一代传感器器件。 正确 、正确。 错误 、错误。 |
[判断题]高通滤波器允许低频信号通过，抑制或减弱高频信号。 正确 、正确。 错误 、错误。 |
[判断题]对于光敏电阻，光照越强，阻值越大，电流越小。 正确 、正确。 错误 、错误。 |