【单选题】
500型万用表表盘符号含义2000Ω/V/DC表示___。
A. 直流挡的量限为2000V
B. 交流挡的量限为2000V
C. 直流挡的灵敏度为2000Ω/V
D. 交流挡的灵敏度为2000Ω/V
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相关试题
【单选题】
对功率放大电路的最基本要求是___ 。
A. 输出信号电压大
B. 输出信号电流大
C. 输出信号电压和电流均大
D. 输出信号电压大，电流小
【单选题】
排进路过程中，道岔转换时，如有车辆驶入道岔区段，因道岔控制电路___的极性接点能保持不动，所以道岔能继续转换到底。
A. 1DQJ
B. 1DQJ保持吸起和2DQJ
C. 2DQJ
D. 1DCJ和2DCJ
【单选题】
场间联络线两端设接车进路信号机时，必须使股道上的发车进路信号机所防护的进路长度等于或大于___，否则不准设置接车进路信号机。
A. 400m
B. 800m
C. 1000m
D. 1200m
【单选题】
在SJ电路中，FDGJ接点的作用是___。
A. 防止闪白光带
B. 防止轻型车跳动时错误解锁
C. 检查QJJ电路完整
D. 实现区段锁闭
【单选题】
在有两个发车口的车站往主要发车口发车时，为了防止出站信号机开放一个绿灯前有先闪一下两个绿灯的现象，电路中采用的安全措施是___。
A. LXJ先于ZXJ吸起
B. LXJ先于XFJ吸起
C. ZXJ先于XFJ吸起
D. ZXJ先于LXJ吸起
【单选题】
排一条发车进路需按压___按钮。
A. 1个
B. 2个
C. 2至3个
D. 4个
【单选题】
6502电气集中在办理取消进路和人工解锁时，___在进路未解锁前一直保持吸起。
A. ZQJ
B. ZRJ
C. QJ
D. LAJ
【单选题】
6502电气集中在排列进路过程中，进路始端按钮表示灯在___熄灭。
A. 进路锁闭后
B. XJ吸起后
C. 方向电源无电后
D. 选路完毕后
【单选题】
6502电气集中调车XJJ在___时，XJJ1-2线圈自闭电路接在8网络线上。
A. JYJ落下、QJ吸起
B. JYJ吸起
C. XJ吸起
D. QJ落下
【单选题】
6502电气集中在12线上串接QJJ第二组接点其作用是___。
A. 防止提前解锁
B. 防止道岔中途转换
C. 防止迂回电流
D. 保证供电
【单选题】
办理人工解锁时，QJ的落下时机是___。
A. KF-ZQJ-Q无电→QJ↓
B. 1RJJ↑→QJ↓
C. XJJ↓→QJ↓
D. KZ-RJ-H无电→QJ↓
【单选题】
6502电气集中KJ复原的时机是___ 。
A. 进路内第一个道岔区段解锁后
B. 进路锁闭后
C. 信号开放后
D. 进路内所有的区段解锁后
【单选题】
接车方向的并置调车信号机作阻拦信号，此时ZJ吸起所检查的条件电源是 ___。
A. KF-DFJ-Q
B. KF-DJJ-Q
C. KF-列共-DJJ-Q
D. KF-共用-Q
【单选题】
用ZC-8型接地电阻测试仪测量接地电阻值时接线方式为___ 。
A. E端钮接5m导线，P端钮接20m线，C端钮接40m线
B. P端钮接5m导线，C端钮接20m线，E端钮接40m线
C. C端钮接5m导线，E端钮接20m线，P端钮接40m线
D. P端钮接5m导线，E端钮接20m线，C端钮接40m线
【单选题】
按压接车方向调车信号机按钮后可供下列电源中的___。
A. KZ-列共-Q
B. KZ-共用-Q
C. KF-DJJ-Q
D. KF-DFJ-Q
【单选题】
ZC-8型接地电阻测试仪测量接地电阻值时导线的另一端接线方式为___。
A. E、P、C端分别接被测物接地极Eˊ，电位探棒Pˊ和电流探棒Cˊ
B. E、P、C端分别接被电位探棒Eˊ，电流探棒Pˊ和测物接地极Cˊ
C. E、P、C端分别接被电流探棒Eˊ，电位探棒Pˊ和测物接地极Cˊ
D.
E. P、C端分别接被测物接地极Eˊ，电流探棒Pˊ和电位探棒Cˊ
【单选题】
进路排列表示灯电路中并接有四个方向继电器的第___接点。
【单选题】
ZPDJ型非电气化区段多信息移频轨道电路, 在调整状态下,受电端接收盒限入电压应不小于___,轨道电路应可靠工作。
A. 240mV
B. 250mV
C. 280mV
D. 290mV
【单选题】
5/72DCJ自动复原的条件是___ 。
A. 5/71SJ落下
B. 5/72SJ落下
C. KZ-ZQJ-H有电
D. KF-共用-Q有电
【单选题】
办理D3往IG的长调车进路时，有关的FKJ、KJ动作顺序应是___。
A. FKJ自左向右，KJ自右向左顺序吸起
B. FKJ、KJ均为自左向右顺序吸起
C. FKJ、KJ均为自右向左顺序吸起
D. FKJ自右向左，KJ自左向右顺序吸起
【单选题】
对于全波整流电路，整流系数为___。
A. 0.45
B. 0.65
C. 0.75
D. 0.9
【单选题】
变压器的满载测试是检验变压器的___。
A. 功率因数
B. 输出功率
C. 输出电压
D. 输出电流
【单选题】
___描述的只是空间每一点的磁场。
A. 磁感应强度
B. 磁通量
C. 磁场强度
D. 矫顽力
【单选题】
在振荡回路中，当外加电源的频率与回路固有振荡频率相同时所发生的现象，称为 ___ 。
【单选题】
串联谐振又叫___ 。
A. 电流谐振
B. 电压谐振
C. 电感谐振
D. 电容谐振
【单选题】
并联谐振又叫___。
A. 电流谐振
B. 电压谐振
C. 电感谐振
D. 电容谐振
【单选题】
___不是串联谐振电路的特征。
A. 电容中电流等于电感中的电流
B. 电阻上的电压等于电路中的端电压
C. 电感、电容上的电压UC=UL=QU Q为品质因数.
D. 谐振时电路阻抗最小，为纯阻性，电流最大
【单选题】
___不是并联谐振电路的特征。
A. 电容中电流等于电感中的电流
B. 电阻上的电压等于电路中的端电压
C. 电感、电容上的电流IC=IL=QI Q为品质因数.
D. 谐振时电路阻抗最大，Z=L/RC，电流最小
【单选题】
47万用表表盘第 ___条标有∽和VA，指示的是交、直流电压和直流电流值。
【单选题】
14型万用表面板装有转换开关一只，零欧姆调零器一只和接线端子___。
【单选题】
单置调车信号机按钮作始端使用时，___吸起。
A. AJ、2AJ
B. 1AJ、AJ
C. 1AJ、2AJ、AJ
D. 1AJ、2AJ
【单选题】
6502电气集中进路选择继电器JXJ吸起后，在___时复原。
A. 始端按钮继电器落下
B. 终端按钮继电器落下
C. KF-共用-Q断电
D. 道岔操纵继电器落下
【单选题】
6502电气集中9网络线的正极性电源KZ是从___接入。
A. 进路左边
B. 进路右边
C. 进路始端
D. 进路终端
【单选题】
6502电气集中调车信号继电器DXJ受 ___控制。
A. 8线
B. 8线和11线
C. 9线
D. 11线
【单选题】
6502电气集中列车信号继电器LXJ受___控制。
A. 8线
B. 8、11线
C. 9线
D. 11线
【单选题】
进路在锁闭状态时，进路上的道岔不应再转换，此时对道岔实行的锁闭为___。
A. 区段锁闭
B. 故障锁闭
C. 进路锁闭
D. 引导总锁闭
【单选题】
左向运行的进站信号机列车信号主组合的类型图应选用 ___。
A. A-1/LXZ
B. A-2/LXZ
C. B-1/LXZ
D. B-2/LXZ
【单选题】
对于___的车站，组合的排列顺序应选用“S”型排列法。
A. 咽喉区道岔群数目较大
B. 咽喉区道岔群数目较小
C. 咽喉区距离较短
D. 咽喉区距离较长
推荐试题
【单选题】
- What do you do on Sunday?___
A. I 'm a teacher.
B. I play football.
C. You are a student.
D. They clean rooms.
【单选题】
- Our class won the girls' relay race in our school's sports meeting.___
A. That's right.
B. Thanks a lot.
C. Congratulations!
D. It's a pleasure.
【单选题】
- Hi, is Mary there, please?___
A. Hold on. I'll get her.
B. No, she isn't here.
C. Yes, she lives here.
D. Yes, what do you want?
【单选题】
- I am afraid I can't return the book to you before Friday. ___
A. Don't be afraid
B. Be careful
C. Not at all
D. Take your time
【单选题】
- I really don't know how to thank you enough. ___.
A. No problem
B. Think nothing of it
C. Not at all
D. It doesn't matter
【单选题】
- Must I be home before seven? ___.
A. No, you needn't
B. No, you mustn't
C. Yes, you will
D. No, you won't
【单选题】
-I'm sorry to hear that you failed in the exam______.
A. Not at all
B. Oh, thank you.That's very kind of you
C. You are welcome
D. Yes, I'm really sorry
【单选题】
-I will,______.
A. that's all right
B. thank you
C. all right
D. not at all
【单选题】
-Hello, may I speak to Zhao Hua?_____.
A. My name is Zhao Hua
B. I'm Zhao Hua
C. This is Zhao Hua speaking
D. Zhao Hua is me
【单选题】
___This is Mr Smith speaking now.
A. Who are you
B. Who is that
C. Who are you calling
D. What do you want to say
【单选题】
- I was worried about my maths, but Mr. Brown gave me an A.___
A. Don't worry about it.
B. Congratulations! That's a difficult course.
C. Mr. Brown is very good.
D. Good luck to you！
【单选题】
-Would you go to the concert with me?___, but I'm very busy now.
A. I'd like to
B. Sure
C. No problem
D. Certainly
【单选题】
-I'll be away on a business trip. Would you mind looking at my cat?Not at all. _______.
A. I have no time
B. I'd rather not
C. You can leave
D. I'd be happy to
【单选题】
- Hi, Jim! Nice to meet you.____.
A. Certainly
B. Many thanks
C. OK
D. Nice to meet you, too
【单选题】
- Hello, may I speak to Mike?_____
A. Who are you?
B. Sorry, he isn't in.
C. Thank you very much.
D. Yes, here you are.
【单选题】
- Will you join us for lunch?____.
A. No, I won't
B. Yes, with pleasure
C. Yes, please
D. Yes, help yourself
【单选题】
- Thank you for your great dinner. I really enjoyed it._____you enjoyed it.
A. I'm so glad
B. I'm sorry
C. What a pity
D. Surprisingly
【单选题】
- I heard Susan surprised her teacher by working hard. Yes, ___
A. her teacher worked hard.
B. Susan worked hard.
C. the teacher was surprising.
D. Susan was surprised.
【单选题】
- Peter, don't step on the grass_______.
A. It doesn't matter
B. I can't do it
C. Don't worry
D. Sorry, I won't do it again
【单选题】
- How was your journey to Paris? - ____
A. It went very well.
B. I flew there.
C. I love Paris.
D. Thank you for asking.
【单选题】
- I'm sorry for being late, Mr Lt______.
A. All right
B. That's right
C. Not at all
D. Never mind
【单选题】
- Happy birthday to you! ___!
A. Happy birthday to you
B. I'm very glad
C. That's all right
D. Thank you
【单选题】
- Do you like country music?___.
A. Yes, I like basketball a lot
B. It's far too crowded
C. Yes, I'm crazy about it
D. Oh, it's funny
【单选题】
- Have a cup of tea, ____? Thanks a lot.
A. don't you
B. haven't you
C. shall we
D. will you
【单选题】
- Thank God．It's Friday again．A nice weekend!___.
A. Me too
B. Yes，I'll be free then
C. That's all right
D. The same to you
【单选题】
— Write to me when you get home. OK, I ______.
A. must
B. should
C. will
D. can
【单选题】
Tom is so talkative. I’m sure you'll soon get tired ___ him.
A. of
B. with
C. at
D. on
【单选题】
I don't know ____ to deal with such matter.
A. what
B. how
C. which
D. /
【单选题】
___ is your girl friend like? She is very kind and good-looking.
A. How
B. What
C. Which
D. Who
【单选题】
He ___ driving me home, even though I told him I lived nearby.
A. insisted on
B. insisted at
C. insisted that
D. insisted in
【单选题】
We came finally ___the conclusion that she has been telling lies all the time.
A. of
B. into
C. to
D. at
【单选题】
I won’t make the___mistake next time.
A. like
B. same
C. near
D. similar
【单选题】
He ___lives in the house where he was born.
A. already
B. yet
C. still
D. ever
【单选题】
I am not used to speaking ___ public.
【单选题】
I didn’t know what to do, but then an idea suddenly ___to me.
A. appeared
B. happened
C. occurred
D. emerged
【单选题】
Measles （麻疹） ___ a long time to get over.
A. spend
B. spends
C. take
D. takes
【单选题】
A pair of spectacles ___ what I need at the moment.
A. is
B. are
C. has
D. have
【单选题】
— Five days ___ too long for me to wait.
A. was
B. were
C. is
D. are
【单选题】
You had better ___ a doctor as soon as possible.
A. seeing
B. saw
C. see
D. seen
【单选题】
The boy is not happy at the new school. He has ___ friends there.
A. few
B. a few
C. little
D. a little
