【单选题】
ZDJ9 表示电路中元件 R1 的作用主要是防止室外负载短路时保护___不被损坏。
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相关试题
【单选题】
道岔启动电路中1DQJ的1-2线圈串入道岔动作电路的作用有___。
【单选题】
在城市轨道交通网络中,同种制式的线路实现列车过轨运行,一般通过线与线之间的___ 来实现。
A. 正线
B. 联络线
C. 存车线
D. 车场线
【单选题】
___时，进路上轨道区段的解锁顺序是从始终至终端方向逐段解锁。
A. 取消进路
B. 人工解锁
C. 正常解锁
D. 故障解锁
【单选题】
提速道岔断相保护器DBQX输出电压为直流___。
A. 16V～24V
B. 17.5V～28V
C. 24V～28V
D. 28V～32V
【单选题】
ZD6 转辙机齿条块上的削尖齿和___上的圆弧构成内部锁闭。
A. 表示杆
B. 动作杆
C. 锁闭齿轮
D. 减速器
【单选题】
数据通信系统采用___算法保障数据安全性。
A. 公开
B. 加密
C. 叠加
D. IP 协议
【单选题】
发车指示器显示时间的主要作用是供___使用。
A. 调度
B. 维修人员
C. 司机
D. 站务员
【单选题】
两个以上电台使用同一频率而产生的干扰是___。
A. 邻道干扰
B. 同频干扰
C. 阻塞干扰
D. 杂散干扰
【单选题】
在正线和车辆段之间有一段___作为接口， 以安排列车进入/退出运营。
A. 转换轨
B. 防护区段
C. 存车线
D. 渡线
【单选题】
光缆弯曲半径不得小于光缆外径的___倍。
A. 5 倍
B. 10 倍
C. 15 倍
D. 20 倍
【单选题】
联锁图表不包括___内容。
A. 接近区段
B. 始端信号机显示
C. 敌对进路栏
D. 设备防雷
【单选题】
组合架零层配线中，每个组合架零层能安放___端子板。
A. 11块
B. 12块
C. 13块
D. 14块
【单选题】
下列不属于故障-安全的方法是___。
A. 安全对应法
B. 双断保护法
C. 独立电源法
D. 提高电源电压法
【单选题】
列车安全间隔距离信息是根据最大允许车速、___、线路等信息计算出的。
A. 停车位置
B. 前车距离
C. 列车性能
D. 设备状态
【单选题】
只有___的按钮才能兼作相反方向的调车进路的变通按钮。
A. 单置调车信号机
B. 并置调车信号机
C. 差置调车信号机
D. 通过信号机
【单选题】
进路的锁闭按时机分为进路锁闭和___。
A. 立即锁闭
B. 正常锁闭
C. 延时锁闭
D. 接近锁闭
【单选题】
锁闭的进路在其防护信号机关闭后，能随着列车的正常运行，使轨道区段分段___。
A. 自动解锁
B. 人工解锁
C. 人工强制解锁
D. 接近锁闭
【单选题】
各种信号机（调车信号机除外）的直线显示距离不得小于___。
A. 200m
B. 250m
C. 400m
D. 500m
【单选题】
维护检测子系统的显示分历史数据和___两种。
A. 功率
B. 状态数据
C. 实时数据
D. 衰耗
【单选题】
信号 CBTC 无线系统运行在 ISM 频段___。
A. 1.8GHz
B. 2.4GHz
C. 5.8GHz
D. 3.9GHz
【单选题】
传输系统中接口指标测试的测试项目为___。
A. 误码率
B. 丢包率
C. 延时
D. 带宽
【单选题】
进路的性质与方向，由进路的___按钮决定。
A. 始端
B. 终端
C. 始端和终端
D. 道岔按钮
【单选题】
信号机开放后，该进路上有关道岔不能扳动，其敌对信号___。
A. 能开放
B. 有条件开放
C. 不能开放
D. 无车可开放
【单选题】
继电器电源对地电流不得大于___。
A. 0.5mA
B. lmA
C. l.5mA
D. 2mA
【单选题】
当道岔在转换或发生挤岔故障，停电或断线等故障时，必须保证DBJ和FBJ落下，因此必须使用___。
A. 安全型继电器
B. 有极型继电器
C. 电码型继电器
D. 非安全型继电器
【单选题】
ZD6转辙机速动爪与速动片的间隙，在解锁时不小于___。
A. 0.2mm
B. 1.2mm
C. 1.5mm
D. 2mm
【单选题】
ZD6转辙机速动爪与速动片的间隙，在锁闭时为___。
A. 0.3mm～1.7mm
B. 0.5mm～1.7mm
C. 0.3mm～2mm
D. 1mm～3mm
【单选题】
在无任何道岔动作时，电动转辙机电源对地电流不得大于___。
A. 0.5mA
B. 1mA
C. 1.5mA
D. 2mA
【单选题】
ZD9型电动转辙机电源电压为直流___。
A. 160V
B. 180V
C. 200V
D. 220V
【单选题】
ZD9转辙机自动开闭器的动接点在静接点片内的接触深度不小于___。
A. 1mm
B. 2mm
C. 3mm
D. 4mm
【单选题】
___为半波整流型继电器。
A. JZXC-0.14
B. JZXC-480
C. JZXC-H18
D. JZXC-20000
【单选题】
偏极继电器加反向___电压时，衔铁不应吸起，以保证其工作的可靠性。
A. 100V
B. 200V
C. 220V
D. 300V
【单选题】
JWXC-H340型继电器的额定值为直流___。
A. 12V
B. 24V
C. 50V
D. 220V
【单选题】
有两轨道电路区段：1Ω电阻使其中一个区段轨道继电器落下的轨道电路比0.1Ω电阻使轨道另一区段轨道继电器落下的轨道电路灵敏度___。
【单选题】
轨道电路区段无车占用，轨道继电器落下(开路式)或吸起(闭路式)，轨道电路这种状态就是___状态。
【单选题】
能够使轨道继电器释放的___值称为该轨道电路的分路灵敏度。
A. 最小分路电阻
B. 最大分路电阻
C. 最小分路电流
D. 最大分路电流
【单选题】
ZD6 系列电动转辙机移位接触器主要由开关盒、接点弹片、开关座、___、顶销等部件组成。
A. 顶销螺丝
B. 接点弹簧
C. 接点座
D. 触头
【单选题】
已办理开放信号的进路因故道岔断表示，可以___。
A. 取消进路
B. 人工解锁
C. 区段故障解锁
D. 正常解锁
【单选题】
四线制道岔在分线盘上 X1(或 X2)与 X3 线端子测量电压，判断道岔表示电路故障，当测得交流为 105V、直流为 0V，可判断为___。
A. 室外二极管击穿造成短路
B. 室外开路
C. 室内开路
D. 电容短路
【单选题】
列车在站台因故轨道关闭，会导致列车发生以下哪些情况___。
A. 施加 EB
B. VOBC 宕机
C. 通信丢失
D. TOD 黑屏
推荐试题
【单选题】
— May I see your tickets, please?___
A. Sure.
B. No, you can't.
C. No, they are mine.
D. Yes, you can.
【单选题】
— Please help yourself to the seafood.___
A. No, I can't.
B. Sorry, I can’t help.
C. Well, seafood don’t suit.
D. Well, I'm afraid I don't like seafood.
【单选题】
— Would you like to go to the concert with us this evening?___
A. No, I already have plans.
B. I'd love to, but I'm busy tonight
C. No, I really don't like being with you.
D. I'm ill, so I shouldn't go out.
【单选题】
— Congratulations! You won the first prize in today's speech contest.___
A. Yes, I beat the others.
B. No, no, I didn’t do it well.
C. Thank you.
D. It's a pleasure.
【单选题】
— Must I take a taxi? No, you___. You can take my car.
A. had better to
B. don't
C. must not
D. don't have to
【单选题】
— We are going to have a singing party tonight. Would you like to join us?___
A. I'm afraid not, because I have to go to an important meeting.
B. Of course not. I have no idea
C. No, I can’t.
D. That's all set
【单选题】
— How was your trip to London, Jane?___
A. Oh, wonderful indeed.
B. I went there alone.
C. The guide showed me the way.
D. By plane and by bus.
【单选题】
— Hey, Tom, what's up?___
A. Yes, definitely!
B. Oh, not much.
C. What is happening in your life?
D. You are lucky.
【单选题】
— Do you mind my smoking here?___
A. No, thanks.
B. Yes, I do.
C. Yes. I'd rather not.
D. Good idea.
【单选题】
— Did you know that David injured his leg yesterday?Really? ___
A. Who did that?
B. What's wrong with him?
C. How did that happen?
D. Why was he so careless?
【单选题】
— This box is too heavy for me to carry it upstairs.___
A. You may ask for help.
B. I'll give you a hand.
C. Please do me a favor.
D. I'd come to help.
【单选题】
— I wonder if I could use your computer tonight?___ I'm not using it right now.
A. Sure, here you are.
B. I don't know.
C. It doesn't matter.
D. Who cares?
【单选题】
— Excuse me, could you show me the way to the nearest post office?___ Oh yes! Two blocks away from here at the Green Avenue. You can’t miss it.
A. I beg your pardon?
B. What do you mean?
C. You’re welcome.
D. Um, let me think.
【单选题】
— Wow! This is a marvelous room! I’ve never known you’re so artistic.____
A. Great, I am very art-conscious.
B. Don’t mention it.
C. Thanks for your compliments.
D. It's fine.
【单选题】
— Is it possible for you to work late tonight？___
A. I like it.
B. I'll do that.
C. I'd love to. .
D. I think so.
【单选题】
— Unbelievable! I have failed the driving test again!___ This is not the end of the world.
A. Good luck.
B.
C. heer up. C. Go ahead.
D. No problem.
【单选题】
Are you feeling better today, Jack?___
A. There must be something wrong.
B. Just have a good rest.
C. Yes, thank you, doctor. But I still don't feel good.
D. Don’t worry about me.
【单选题】
Thank you so much for your lovely gift.___
A. Never mind.
B. I'm glad you like it.
C. Please don't say so.
D. No, It's not so good.
【单选题】
Would you like something to drink? What about a cup of tea?___
A. No, thanks.
B. No, I wouldn’t
C. Yes, I want.
D. Yes, I like.
【单选题】
What's the problem with your bike?___
A. Not at all.
B. Good, thank you.
C. Nothing serious.
D. Sure.
【单选题】
Good morning, John. How are you doing?___
A. I'm pleased
B. Good night.
C. Not so bad. And you?
D. How do you do?
【单选题】
How do you do?___
A. Fine, thank you.
B. How do you do?
C. Not too bad.
D. Very well.
【单选题】
Good-bye for now.___
A. The same to you.
B. That's OK
C. See you.
D. Long time no see.
【单选题】
Hello, how are you?___
A. Hello, how are you?
B. How do you do?
C. Fine, thank you.
D. That's OK.
【单选题】
I didn't mean to do that. Please forgive me。___
A. Not too bad.
B. That's all right
C. It's a pleasure.
D. Thank you.
【单选题】
Thank you for your invitation.___
A. It doesn’t matter.
B. It's a pleasure.
C. It's a small thing.
D. I'll appreciate it.
【单选题】
What a beautiful dress you have on today!___
A. It is suitable for me.
B. No, it isn’t.
C. You want to have one, too?
D. Thank you.
【单选题】
I think he is a good lecturer.___
A. Sorry, it doesn’t matter.
B. So do I.
C. Yes. It's a good idea
D. I don't mind
【单选题】
— What's the matter, dear?___
A. I didn't go to school.
B. I have a terrible headache.
C. I took the kids shopping today.
D. It is a beautiful dress.
【单选题】
Good morning, may I speak to Mark, please?___
A. Who's there?
B. Who's that speaking?
C. Who are you?
D. Who wants to speak to Mark?
【单选题】
Let me introduce myself. I'm Steward.___
A. What a pleasure.
B. Pleased to meet you.
C. I don't know.
D. Thanks a lot.
【单选题】
Let's go to the library this afternoon.___.
A. Yes, that's right.
B. No. I can't.
C. What about you?
D. That's a good idea.
【单选题】
What does Tom's wife do for a living?___.
A. She is a doctor.
B. Tom loves his wife.
C. She has a happy life.
D. She lives far from here.
【单选题】
How tall is your sister?___
A. She is not very well.
B. She is 28 years old.
C. She is very nice.
D. She is as tall as I am.
【单选题】
What do you think of this novel?___
A. I've read it.
B. It's well-written.
C. It was written by my uncle.
D. I bought it yesterday.
【单选题】
How much is this necklace?___
A. It's very nice.
B. It's a birthday present from my parents.
C. It costs fifty pounds.
D. It's a bargain.
【单选题】
How can I get to the cinema?___
A. It's very far.
B. Yes, there is a cinema near here.
C. It's well known.
D. Go down this street and turn left.
【单选题】
What's the matter, John?___
A. I failed my French test
B. It doesn't matter.
C. Nothing's wrong with him.
D. I don't think I can.
【单选题】
What are you majoring in?___
A. In a university.
B. Very hard.
C. Mathematics.
D. At nine in the morning.
【单选题】
Are you going on holiday for a long time?___
A. It was a long time.
B. Two weeks ago.
C. No. Only a couple of days.
D. Not long time ago.
