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【单选题】
_____ her and then try to copy what she does.
A. Mind
B. See
C. Stare at
D. Watch
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D
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The computer system ____ suddenly while he was searching for information on the Internet.
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______ the War of Independence, the United States was an English colony.
A.
B. efore B. At
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A police officer claimed he had attempted to ____ paying his fare.
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While I was in the university, I learned taking photos, ______ is very useful now for me.
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He is not seriously ill, but only a ____ headache.
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On average, a successful lawyer has to talk to several ____ a day.
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You shouldn't ______ your time like that, Bob, and was cold yesterdak tonight.
A. cut
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Both the kids and their parents ____ English, I think. I know it from their accent.
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You had better ___ a doctor as soon as possible.
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He opened the letter and it contained ___.
A. an important information
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He has been writing for 3 years, but being a writer is not his ___.
A. chance
B. choice
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They have never heard any ___.
A. a customer complaint
B. the customer's complaints
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He is not a child ___.
A. no more
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The retired man is used to ___ his two dogs early in the morning.
A. exercise
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It was not ___ midnight that they discovered the children were not in their bedroom.
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Young ___ he is, he knows how to get along with others.
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Could you show me where the___ shoes are?
A. Women
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He succeeded ___ out a lot of things entirely new in the world.
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It took me a long time to ___ the disappointment of failing the exam.
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She ___ 100 pages of the book today.
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He has been ___ for nearly three weeks after the death of his dear pet.
A. sad
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One cannot learn a foreign language well ___he studies hard.
A. unless
B. if
C. as
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A large number of people___ present at the meeting, which was out of our expectation.
A. was
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When the girls saw the funny man, they couldn't ___ laughing.
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We are glad that we finally managed to get into contact ___ them.
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This kind of plant___a lot of water at all times.
A. assumes
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Look! Here ___ the famous player.
A. comes
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Uncle Sam sent him a___ bicycle as a birthday present.
A. red sports new
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I couldn't find my English-Chinese dictionary___.
A. anywhere
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The plane was about to___, and yet I left my ticket behind.
A. take off
B. take on
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【单选题】
John succeeded ___ what he wanted.
A. to get
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A. for
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With a good command of reading skills, most students can manage to read ___as they could the year before.
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Some famous singers live on the ___from their record sales.
A. salary
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_____of them thinks that is a good idea.
A. Anyone
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【单选题】
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A. strange
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A. 平放
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(71395)测量额定电压为500 V以下电气设备的绝缘电阻,应选用( )兆欧表。[321110720](1.0分___)
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【单选题】
(71396)熔断器的额定电流是指容许通过的( )。(1.0分)___
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(71397).测量额定电压为500 V以上电气设备的绝缘电阻,应选用( )兆欧表。[322110720](1.0分)___
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【单选题】
(71398).使用钳形电流表测量电流时,如被测电流较小,可将被测导线多绕几圈套入钳口测量,用指针所指读数( )所绕线圈数即为实际电流值332110205(1.0分)___
A. 乘以
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C. 加上
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【单选题】
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A. 220 V
B. 380 V
C. 500 V
D. 5 000 V
【单选题】
(71400).手持电动工具电源线长度不够时,应用( )。[321120504](1.0分)___
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【单选题】
(71401).试电笔检测电压的范围为( )。[213110505](1.0分)___
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【单选题】
(71402)列车及调车作业中发生冲突、脱轨、火灾、爆炸、相撞,造成客运列车报废1辆或大破2辆以上的,为( )。(1.0分)___
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【单选题】
(71403)使用剥线钳时,选择的切口直径必须( )导线线芯直径,以免剥削时切伤线芯。[212110507](1.0分)___
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(71404)使用电工钳剪切导线时,禁止同时剪切2根以上( )导线。[312110507](1.0分)___
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(71405)同一系列和结构的蓄电池内阻与容量的大小( )。[331110645](1.0分)___
A. 成正比
B. 成反比
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D. 不能比较
【单选题】
(71406)配制酸性电解液时,配液室内应备有( )水溶液,以备电解液溅到皮肤或衣服上时,用其冲洗。[332110645](1.0分)___
A. 氢氧化钠
B. 氯化钠
C. 氢氧化铵
D. 硼酸
【单选题】
(71407)配制碱性电解液时,配液室内应备有( )水溶液,以备电解液溅到皮肤上时,用其冲洗。[333110645](1.0分)___
A. 硫酸
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【单选题】
(71408)基尔霍夫第一定律也叫( )电流定律。[223110207](1.0分)___
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C. 支路
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(71409)电风扇在额定电压下连续工作1 h,机体表面最高温升不超过( )。(1.0分)___
A. 12 ℃
B. 24 ℃
C. 30 ℃
D. 45 ℃
【单选题】
(71410)基尔霍夫第二定律也叫( )电压定律。[213110207](1.0分)___
A. 回路
B. 节点
C. 支路
D. 网孔
【单选题】
(71411)关闭折角塞门发出列车或运行中关闭折角塞门的为( )。(1.0分)___
A. 一般A类事故
B. 一般B类事故
C. 一般C类事故
D. 一般D类事故
【单选题】
(71412)求解复杂电路,最常用的方法是( )。[213110206](1.0分)___
A. 支路电流法
B. 回路电流法
C. 戴维南定理
D. 不能确定
【单选题】
(71413)判断感生电动势的方向,通常用( )定律。[223110207](1.0分)___
A. 法拉第电磁感应
B. 楞次
C. 欧姆
D. 电磁感应
【单选题】
(71414)电感量一定的线圈,产生自感电动势大,说明该线圈中通过电流的( )。[233110207](1.0分)___
A. 数值大
B. 变比量大
C. 时间长
D. 变化率大
【单选题】
(71415)( )由铁道部组织事故调查组进行调查。(1.0分)___
A. 特别重大事故
B. 重大事故
C. 较大事故
D. 一般事故
【单选题】
(71416)BY-2型逆变器的工作电压为直流( )。(1.0分)___
A. 25~30 V
B. 30~35 V
C. 36~40 V
D. 44~65 V
【单选题】
(71417)由磁路欧姆定律可知,电磁设备要获得一定的磁通,磁路中气隙越大,所需励磁电流( )。[233110205](1.0分)___
A. 越大
B. 越小
C. 不变
D. 无法确定
【单选题】
(71418)铁道部、安全监管办的安全监察部门应在事故调查组工作结束后( )之内,根据事故报告,制作《铁路交通事故认定书》,经批准后,送达相关单位。(1.0分)___
A. 5日
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【单选题】
(71419)用万用表的不同欧姆挡测量二极管的正反向电阻时,获得的结果差异较大,这是因为( )。[322110230](1.0分)___
A. 该二极管已损坏
B. 万用表各挡存在偏差
C. 二极管电阻是可变的
D. 二极管的伏安特性是非线性的
【单选题】
(71420)BY-2型逆变器的频率为( )。(1.0分)___
A. 33 kHz±5 kHz
B. 36 kHz±5 kHz
C. 39 kHz±5 kHz
D. 42 kHz±5 kHz
【单选题】
(71421)单相半波整流时,二极管实际承受的反向电压的最大值,出现在二极管( )。[233110210](1.0分)___
A. 截止时
B. 导通时
C. 由截止转向导通时
D. 不确定
【单选题】
(71422)晶体三极管是( )控制元件。[222110211](1.0分)___
A. 线性
B. 电压
C. 电流
D. 功率
【单选题】
(71423)晶体三极管作开关用时,工作于( )。[212110211](1.0分)___
A. 放大区
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D. 截止区
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