相关试题
【判断题】
三相绕组的首端（或尾端）连接在一起的共同连接点称电源中性点
【判断题】
测量设备的绝缘，无论在天气好坏，气候干湿等情况下，对测量结果都无影响
【判断题】
送电时，先合上线路侧刀闸，再合母线侧刀闸，再合开关。
【判断题】
一般在距接地点15m以外，可以认为地电位为零
【判断题】
变压器的常见故障有绝缘老化，绝缘油劣化，过电压引起的故障，套管及引线故障等
【判断题】
为了防止和减缓绝缘老化，必须严格掌握变压器内的负荷，严格控制上层油温和温升
【判断题】
电流互感器二次侧必须有一点及以上的接地
【判断题】
变压器的运行电压不得超过该变压器运行分接额定电压
【判断题】
在中性点接地系统中，发生单相接地时，网络线电压的大小和相位差保持不变
【判断题】
反时限过流保护是指动作时间随短路电流的增大而减小
【判断题】
新投入或大修后投入运行的电气设备在72小时内应加强巡视
【判断题】
电流互感器的一次电流决定于一次负荷的大小而与次负荷无关
【判断题】
运行中的变压器上层油温超过85℃时应立即停用变压器
【判断题】
在停电或带电的情况下均可用万用表进行阻值测量
【判断题】
变压器铁芯是否需要接地应结合中性点接地情况来判定
【判断题】
在一段电阻电路中，如果电压不变，当增加电阻时，电流减少，如果电阻不变，增加电压时，电流就减小。
【判断题】
流过熔体的电流与熔断时间的关系称作熔断器的保护特性。
【判断题】
测量直流电压时，电压表的“+”端钮要接在电路中电位较低的点。
【判断题】
变压器一二次侧电流之比与一次侧匝数之比成正比。
【判断题】
发现断路器严重漏油或漏气时，应采取禁止跳闸的措施。
【判断题】
为了防止和减缓绝缘老化，必须严格掌握变压器内的负荷，严格控制上层油温和温升
【判断题】
若变压器内部故障引起着火时，则不能放油以防爆炸
【判断题】
允许用刀闸拉合电容电流不超过5A的无负荷线路
【判断题】
当误拉刀闸时，在刀闸出头尚未全部拉开，即发现有电弧，应立即快速拉开刀闸
【判断题】
遇有电气设备着火时，对带电设备可以使用泡沫灭火器灭火
【判断题】
电压互感器可以两点接地，也可以一点接地
【判断题】
有功功率P与视在功率S之比成为功率因数。
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B. Never mind.
C. Quite right.
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A. call my Charles
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A. Yes, please.
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— Thank you for inviting me.___
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— Would you like to go to the concert with us this evening?___
A. No, I already have plans.
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— Congratulations! You won the first prize in today's speech contest.___
A. Yes, I beat the others.
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A. had better to
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— 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.
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— How was your trip to London, Jane?___
A. Oh, wonderful indeed.
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A. No, thanks.
B. Yes, I do.
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— Did you know that David injured his leg yesterday?Really? ___
A. Who did that?
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— This box is too heavy for me to carry it upstairs.___
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— 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.
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— 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.
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— 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.
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— Is it possible for you to work late tonight？___
A. I like it.
B. I'll do that.
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— Unbelievable! I have failed the driving test again!___ This is not the end of the world.
A. Good luck.
B.
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Are you feeling better today, Jack?___
A. There must be something wrong.
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C. Yes, thank you, doctor. But I still don't feel good.
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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.
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A. No, thanks.
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A. Not at all.
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Good morning, John. How are you doing?___
A. I'm pleased
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How do you do?___
A. Fine, thank you.
B. How do you do?
C. Not too bad.
D. Very well.
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Good-bye for now.___
A. The same to you.
B. That's OK
C. See you.
D. Long time no see.
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Hello, how are you?___
A. Hello, how are you?
B. How do you do?
C. Fine, thank you.
D. That's OK.
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I didn't mean to do that. Please forgive me。___
A. Not too bad.
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Thank you for your invitation.___
A. It doesn’t matter.
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What a beautiful dress you have on today!___
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