【单选题】
ZYJ7-220/1800电液转辙机动作时间不大于_______。___
A. 8s
B. 12.5s
C. 17.5s
D. 24s
查看试卷，进入试卷练习
微信扫一扫，开始刷题
相关试题
【单选题】
ZYJ7-220/1800电液转辙机单线电阻不大于_______。___
A. 30Ω
B. 45Ω
C. 54Ω
D. 58Ω
【单选题】
ZYJ7-A220/1800电液转辙机动作时间不大于_______。___
A. 8s
B. 9s
C. 17.5s
D. 24s
【单选题】
ZYJ7-B220/1800电液转辙机动作时间不大于_______。___
A. 8.5s
B. 9s
C. 17.5s
D. 24s
【单选题】
ZYJ7-E180/1800电液转辙机动作时间不大于_______。___
A. 3.8s
B. 5.5s
C. 7.5s
D. 9s
【单选题】
ZYJ7-F180/4000电液转辙机额定转换力为_______。___
A. 3kN
B. 4kN
C. 5kN
D. 6kN
【单选题】
ZYJ7-F180/4000电液转辙机动作时间不大于_______。___
A. 3.8s
B. 6s
C. 7.5s
D. 9s
【单选题】
ZYJ7-G220/1800电液转辙机动作时间不大于_______。___
A. 3.8s
B. 6s
C. 7.5s
D. 10.5s
【单选题】
ZYJ7-J170/4000电液转辙机动作时间不大于_______。___
A. 3.8s
B. 6s
C. 7.5s
D. 10.5s
【单选题】
ZYJ7-K130/4000电液转辙机动作时间不大于_______。___
A. 3.8s
B. 5s
C. 7.5s
D. 10.5s
【单选题】
ZYJ7-L220/4000电液转辙机动作时间不大于_______。___
A. 3.8s
B. 5s
C. 8s
D. 10.5s
【单选题】
ZYJ7-N220/1800电液转辙机动作时间不大于_______。___
A. 3.8s
B. 5s
C. 8s
D. 12s
【单选题】
ZYJ7GZ-220/1800电液转辙机动作时间不大于_______。___
A. 3.8s
B. 5s
C. 8.5s
D. 12s
【单选题】
ZYJ7-P220/4200电液转辙机动作时间不大于_______。___
A. 3.8s
B. 5s
C. 12s
D. 15s
【单选题】
ZYJ7-220/1800电液转辙机动作压力不大于_______。___
A. 9.5MPa
B. 10.8MPa
C. 12.0MPa
D. 12.5MPa
【单选题】
ZYJ7-220/1800电液转辙机溢流压力不大于_______。___
A. 9.5MPa
B. 10.8MPa
C. 12.0MPa
D. 12.5MPa
【单选题】
ZYJ7-220/1800电液转辙机溢流时拉力约为_______。___
A. 2.5kN
B. 2.7kN
C. 3kN
D. 3.8kN
【单选题】
ZYJ7-120/4200电液转辙机溢流时拉力约为_______。___
A. 2.5kN
B. 2.7kN
C. 3kN
D. 5.5kN
【单选题】
ZYJ7-J170/4000电液转辙机额定转换力为_______。___
A. 2.5kN
B. 2.7kN
C. 4kN
D. 5.5kN
【单选题】
500型万用表表盘第_______条(从上到下)标有R或Ω，指示的是电阻值。[211000000]___
【单选题】
500型万用表表盘第_______条标有∽和VA，指示的是交、直流电压和直流电流值。[211000000]___
【单选题】
500型万用表表盘第_______条标有10V，指示的是10V的交流电压值。[211000000]___
【单选题】
500型万用表表盘第_______条标有dB，指示的是音频电平。[221000000]___
【单选题】
为了使PNP型晶体三极管工作于饱和区，必须保证_______。[232010102]___
A. 发射极正偏，集电极正偏
B. 发射极正偏，集电极反偏
C. 发射极正偏，集电极零偏
D. 发射极反偏，集电极正偏
【单选题】
500型万用表表盘符号含义A-V-Ω表示可测量_______。[222000000]___
A. 电压和电阻
B. 电流和电压
C. 电流、电压及电阻
D. 功率、电压及电阻
【单选题】
500型万用表表盘符号含义45-65-1000Hz表示_______。[222000000]___
A. 使用频率范围为1000Hz以下，工作电压为45V～65V
B. 使用频率范围为1000Hz以上，工作电压为45V～65V
C. 使用频率范围为1000Hz以下，标准工频范围为45Hz～65Hz
D. 使用频率范围为1000Hz以上，标准工频范围为45Hz～65Hz
【单选题】
500型万用表表盘符号含义2000Ω/V/DC表示_______。[222000000]___
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
【单选题】
对功率放大电路的最基本要求是_______。[332010102]___
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】
对于全波整流电路，整流系数为_______。[322010102]___
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_______。[232000000]___
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。[231000000]___
【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_______。[232000000]___
【单选题】
串联谐振又叫_______。[332010102]___
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_______。[332010102]___
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。[332010102]___
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。[332010102]___
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。[211000000]___
【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_______。[211000000]___
【单选题】
用数字表测量交直流电流时_______。[211000000]___
A. 红表笔插入V/Ω孔，黑表笔插入COM孔
B. 红表笔插入DB孔，黑表笔插入COM孔
C. 红表笔插入MACX孔，黑表笔插入COM孔
D. 红表笔插入mA孔或10A孔，黑表笔插入COM孔
【单选题】
用数字表测量电阻时_______。[222000000]___
A. 红表笔插入V/Ω孔，黑表笔插入COM孔
B. 红表笔插入DB孔，黑表笔插入COM孔
C. 红表笔插入MACX孔，黑表笔插入COM孔
D. 红表笔插入mA孔或10A孔，黑表笔插入COM孔
【单选题】
如果被测电阻值超出所选择量程的最大值，万用表将显示_______，这时应选择更高的量程。[221000000]___
A. “1”
B. “000”
C. “－”
D. 无显示
推荐试题
【单选题】
— How are you, Bob?___
A. How are you?
B. I'm fine. Thank you.
C. How do you do?
D. Nice to meet you.
【单选题】
— Thanks for your help.___
A. My pleasure.
B. Never mind.
C. Quite right.
D. Don't thank me.
【单选题】
— Hello, my name is Charles Green, but ___ .
A. call my Charles
B. call me at
C. harles C. call me Charles
D. call Charles me
【单选题】
— ___, and how are you?
A. Don't mention it
B. Hm, not too bad
C. Thanks
D. Pretty fast
【单选题】
— I'm sorry. I am late due to the heavy traffic___
A. Well, it's OK.
B. No, it's all right.
C. You are welcome.
D. You are wrong.
【单选题】
— It's rather cold in here. Do you mind if I close the window?___
A. Yes, please.
B. No, please.
C. Sure, please.
D. I don't like it.
【单选题】
___He teaches physics in a school.
A. What does your father do?
B. Who is your father?
C. What is your father doing?
D. Where is your father now?
【单选题】
— Excuse me, how much is the jacket?___ It's 499 Yuan.
A. Oh, no. That's OK!
B. How do you like it?
C. Which do you prefer?
D. Would you like to try it on?
【单选题】
— Could you help me with my physics, please？___
A. No, no way.
B. No, I couldn't
C. No, I can't.
D. Sorry I can't. I have to go to a meeting right now.
【单选题】
— Could I speak to Don Watkins, please?___
A. Speaking, please.
B. Oh, how are you?
C. I'm listening.
D. I'm Don.
【单选题】
— Could I borrow your car for a few days?___
A. Yes, you may borrow.
B. Yes, go on.
C. Sure, here is the key. Enjoy your journey.
D. It doesn't matter.
【单选题】
— Thank you for inviting me.___
A. I really had a happy time.
B. Oh, it's too late.
C. Thank you for coming.
D. Oh, so slowly?
【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
