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闸刀开关（简称闸刀）是一种用来接通或断开电路的手动高压开关
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相关试题
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接触器是在内外信号的作用下，应用电磁吸力闭合或断开电路的电器
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继电器是一种专门用来传递电流以自动接通和分断控制电路的电器
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当线路中发生短路、过载、失压等不正常现象时，自动空气开关能自动切断电路
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触电形式有单相触电、两相触电、多相触电
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触电急救的第一步是现场救护，第二步是使触电者迅速脱离电源
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触电者未失去知觉时，应安放在空气流通，温暖处安静休息，同时请医生
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电工所用的导线分成两大类，即电磁线和电力线
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万用表又称多用表、三用表或复用表，是一种多功能、多量程的测量仪表
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兆欧表是一种专门用来测量电机、电气设备及线路绝缘电阻的便携式仪表
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客车分运送旅客、为旅客服务和特殊用途等3种车辆
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铁路车辆的基本构造有走行装置、车体、车钩缓冲装置、制动装置、车内设备
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走行装置是支撑车体，承担车辆重量并在钢轨上行驶的部分
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车体由车轮所支承，是容纳旅客、货物和整备品等的部分
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钩头里装有钩舌、钩舌销、钩提杆、钩舌推铁和钩锁铁等零部件
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制动机的作用一般有充气缓解作用、制动作用、保压作用三种
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车辆标记用于标明车辆的配属、用途、编号、主要参数、方向、位置等（文）数字和代号
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目前我国铁道车辆的检修制度是以计划预防为主，状态修为辅的检修制度
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车辆计划预防性检修制度分为定期检修和日常维修两大类
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高速铁路车辆一般由车体、走行装置、牵引缓冲装置、制动装置、车辆内部装置和车辆电气装置等七部分组成
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高速铁道车辆一般采用密接式中央牵引缓冲连挂装置
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蓄电池一般可分为酸性（铅）蓄电池和碱性（铁镍和镉镍）蓄电池两种
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铅蓄电池的电解液是用浓硫酸和纯水按1：1比例调制而成的稀硫酸
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TG型电池充电后电解液相对密度为1.280g/cm³±0.005g/cm³(30ºC)
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测量方法是使用胶囊式比重计（又称吸管式比重计）
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蓄电池初充电是指新造电池使用的第一次充电
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普通充电是指运用电池，因放电或经过检修后为恢复容量而进行的充电
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为了检查电池充电后的容量，都要进行放电试验
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长期停用的母车电池自放电严重等，造成电流容量过亏时，可在车库内进行补充电
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镉镍蓄电池由正极板、负极板，隔离物（隔膜），壳体和电解液五大部分组成
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J5感应子发电机的构造由机座、定子铁芯、转子铁芯、激磁绕组和电枢绕组、端盖、轴承及轴承盖等部分组成
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KP-2A型控制箱的主整流回路的主整流器由D1～D6六只整流二极管组成
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KP-2A型控制箱的三相桥式整流器的作用是将发电机发出的三相直流电变成交流电供给负载.
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激磁、测量及限流充电回路构成了KP-2A型控制箱的稳压电路
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KP-2A型控制箱激磁回路的作用是向发电机激磁绕组提供方向和大小不变的脉动直流电
推荐试题
【单选题】
What did Dr. White’s research reveal about people living in a green environment? ___
A. Their stress was more apparent than real.
B. Their decisions required less deliberation.
C. Their memories were greatly strengthened.
D. Their communication with others improved.
【单选题】
According to Dr. White, what should the government do to build more green spaces in cities? ___
A. Find financial support.
B. Improve urban planning.
C. Involve local residents in the effort.
D. Raise public awareness of the issue.
【单选题】
The survey by the Kaiser Family Foundation is mentioned to illustrate the idea that . ___
A. kids don’t always follow parents’ rules
B. only few parents believe the good news
C. much media use results in bad health
D. parents’ rules make a huge difference
【单选题】
What did the kids do when parents set any time or content limits, according to the Kaiser Family Foundation? ___
A. They cut down on their screen time.
B. They appreciated their parents’ love.
C. They spent more time staying outdoor.
D. They accepted parents’ rules unwillingly.
【单选题】
What will Kenneth Ginsburg most probably suggest that parents should do? ___
A. Avoid setting firm rules.
B. Avoid ruling with an iron grip.
C. Set rules after family discussion.
D. Set rules that are easy to understand.
【单选题】
Margaret Broe -Fitzpatrick finds it impossible. ___
A. to achieve just- right parenting
B. to keep track of everything done by the kids
C. for the kids to face rules alone
D. for the kids to observe rules without protest
【单选题】
The passage is mainly intended for parents . ___
A. whose kids have difficulty in self- discipline
B. whose kids are addicted to media use
C. who have doubts about setting rules
D. who are too busy to care for their kids
【单选题】
The word “it” (Para. 2) most probably refers to. ___
A. the lack of stable communities
B. the breakdown of informal information channels
C. the increased mobility of families
D. the growing number of people moving from place to place
【单选题】
The main problem people may encounter today arises from the fact that . ___
A. they have to learn new things consciously
B. they lack the confidence of securing reliable and trustworthy information
C. they have difficulty obtaining the needed information readily
D. they can hardly carry out casual communications with an extended family
【单选题】
From the passage we can infer that _______. ___
A. electronic mail will soon play a dominant role in transmitting messages
B. it will become more difficult for people to keep secrets in an information era
C. people will spend less time holding meetings or conferences
D. events will be reported on the spot mainly through satellites
【单选题】
Technology facilitates _______. ___
A. sharing information
B. storing and sending information
C. providing people with easy access to more information
D. all of the above
【单选题】
We can learn from the last paragraph that _______. ___
A. it is necessary to obtain as much
B. people should make the best use of the information
C. we should realize the importance of accumulating information
D. it is of vital importance to acquire needed information efficiently
【单选题】
The author thinks that people are _________. ___
A. satisfied with their appearance
B. concerned about appearance in old age
C. far from neglecting what is in fashion
D. reluctant to follow the trends in fashion
【单选题】
Fashion magazines and TV advertisements seem to link fashion to _________. ___
A. confidence in life
B. personal dress
C. individual hair style
D. personal future
【单选题】
Causes of fashions are _________. ___
A. uniform
B. varied
C. unknown
D. inexplicable
【单选题】
Present-day society is much freer and easier because it emphasizes _________. ___
A. uniformity
B. formality
C. informality
D. individuality
【单选题】
Which is the main idea of the last paragraph? ______________ ___
A. Care about appearance in formal situations.
B. Fashion in formal and informal situations.
C. Ignoring appearance in informal situations.
D. Ignoring appearance in all situations.
【单选题】
Permissive parents would ________. ___
A. let their children read any books they like to
B. not let their children see any films they like to
C. not let their children read any books without first checking their contents
D. let their children see the films with their first checking
【单选题】
The fact that parents check the contents of the book or the film for their children to read or see shows __________. ___
A. the necessity of censorship
B. that many books and films are bad
C. that children need their parents to help them understand more
D. that the parents are permissive
【单选题】
Which of the following statements is NOT true?____________ ___
A. Some adults can’t tell right from wrong.
B. Censorship is compared to the law because both of them perform good service to society as a whole.
C. Censors pay attention only to genuine works of art.
D. Censorship is necessary because many books, plays and films are far from being “works of art”.
【单选题】
What does the word “corrupt” in Para.4 mean?__________ ___
A. Make morally bad.
B. Hurt.
C. Injure.
D. Damage.
【单选题】
What would be the best title of this passage?_____________ ___
A. Permissive Parents and Responsible Parents.
B. Censorship and the Law.
C. Censors Value Artistic Merits .
D. Censorship Performs Good Service to Society.
【单选题】
Lie detectors are widely used in the United States because _____________. ___
A. they can help detect people’s emotional stress
B. they can help detect people's physiological changes
C. they can help find out whether a person is telling the truth or not
D. they can measure the subject’s electrical resistance
【单选题】
According to the passage, we know that Britain______________. ___
A. will adopt lie detectors widely
B. will adopt lie detectors on a smaller scale
C. adopt lie detectors
D. has not decided whether to adopt lie detectors or not
【单选题】
The tests themselves are by no means free from error..." (Line 1-2.Para.3) means ____________. ___
A. the tests definitely have no error
B. the tests sometimes make mistakes
C. the polygraphers do not make mistakes
D. the polygraphers can avoid error by using some techniques
【单选题】
Which of the following is true? ________________ ___
A. The tests are conducted by qualified polygraphers.
B. Innocent people may blush or stammer when questioned.
C. Guilty people can definitely be found out by answer questions
D. Guilty people may escape by refusing to answer questions.
【单选题】
What troubles lie detector researchers most is that _______________. ___
A. innocent people are convicted crimes
B. innocent people will learn to tell lies
C. lie detectors may cause industrial unrests
D. lie detectors are sometimes not dependable
【单选题】
In the passage the author's attitude towards "mixed-ability teaching" is _______. ___
A. critical
B. questioning
C. approving
D. objective
【单选题】
By "held back" (Line 1) the author means _____. ___
A. made to remain in the same classes
B. forced to study in the lower classes
C. drawn to their studies
D. prevented from advancing
【单选题】
The author argues that a teacher's chief concern should be the development of the student's _________. ___
A. personal qualities and social skills
B. total personality
C. learning ability and communicative skills
D. intellectual ability
【单选题】
Which of the following is NOT MENTIONED in the third paragraph? __________ ___
A. Group work gives pupils the opportunity to learn to work together with others.
B. Pupils also learn to develop their reasoning abilities.
C. Group work provides pupils with the opportunity to learn to be capable organizers.
D. Pupils also learn how to participate in teaching activities.
【单选题】
The author's purpose in writing this passage is to ______. ___
A. argue for teaching bright and not-so-bright pupils in the same class
B. recommend pair work and group work for classroom activities
C. offer advice on the proper use of the library
D. emphasize the importance of appropriate formal classroom teaching
【单选题】
According to the author, the deaths among youth are mainly caused by _____. ___
A. traffic accidents
B. smoking-related diseases
C. murder
D. all of these
【单选题】
Every day there are over_____high school students who will become regular smoker. ___
A. 75
B. 23
C. 30
D. 3000
【单选题】
By "dropout" the author means______. ___
A. students who failed the examination
B. students who left school
C. students who lost their way
D. students who were driven out of school
【单选题】
The reason for declining adolescent smoking is that ________. ___
A. NCI has taken effective measures
B. smoking is prevented among high school seniors
C. there are many smokers who have died of cancer
D. not stated
【单选题】
What is implied but not stated by the author is that ________. ___
A. smoking rates among youth have declined very little
B. there are now more female than male smokers among high school seniors
C. high smoking rates are due to the increase in wealth
D. smokers at high school are from low socio-economic backgrounds
【单选题】
According to the passage, which of the following is NOT a disadvantage of part time education? _______________ ___
A. It requires some break in one's career.
B. It tends to last too long for many people to complete a degree program.
C. It affects one's career.
D. It gives the student less time to share with the family.
【单选题】
Which of the following is NOT an advantage of distance learning? _________ ___
A. The student may choose his or her own pace.
B. The student may study at any time to his or her convenience.
C. They can pursue their chosen career while studying.
D. Their tutorial assistance comes through regular airmail, telephone, etc.
【单选题】
What benefit will distance learning program bring to a business? __________ ___
A. Recruitment of more talented people.
B. Good image of the business.
C. Better cooperation with universities.
D. Further training of employees and business growth.
