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【判断题】
若U 2 为电源变压器副边电压的有效值,则半波整流电容滤波电路和整流电容滤波电路在空载时的输出电压均为√2U 2A.
正确
B.
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举一反三
【简答题】1 Q: What has made the man sweat all over the floor?
【简答题】下图所示电路中,在保持R1、R2 不变的情况下,当增大R3时,a 、b两点电位的变化是A. B. C. D.
【单选题】Q:What does the man mean?
A.
He has to do other repairs first.
B.
He doesn’t want to help the woman.
C.
He will come to her place immediately.
D.
He wants to attend the woman’s party.
【单选题】Q: What does the man mean?
A.
The woman should buy more things.
B.
The woman has bought everything she wants to.
C.
The woman has forgotten something.
D.
The woman should not have bought everything.
【简答题】5W: As they say, one man’s meat is another man’s poison. M: Sure. Q: What does the woman mean? 6M: Thank you very much for the meal. W: Not at all. I’m glad you could come. Q: Why does the man...
【单选题】Q: What does the man imply?
A.
Teresa still lives in Canada.
B.
Teresa no longer lives in Canada.
C.
He has never heard about Teresa.
D.
He lost touch with Teresa.
【单选题】Long conversation: Q 1: What has made the man sweat all over the floor?
A.
Working in his office.
B.
Walking with a friend.
C.
Running in a park.
D.
Exercising in a gym.
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