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【单选题】
关于电感的下列说法，错误的是（）。A.
由于实际中没有无穷大功率电源，实际电感两端的电压不能跃变
B.
由于实际中没有无穷大功率电源，实际电感中的电流不能跃变
C.
由于实际中没有无穷大功率电源，实际电感中的磁链不能跃变
D.
若电感L上的电压uL、电流iL的参考方向相同
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反馈参考答案：
举一反三
【单选题】Have you worked there long?
A.
Yes, I have worked there for more than fifteen years.
B.
I am bored.
C.
I like my job very much.
D.
I don't know.
【简答题】As you worked late yesterday, you ______ have come this morning. A. needn’t B. mayn’t C. can’t D. mustn’t
【单选题】As you worked late yesterday,you_________have
A.
19. As you worked late yesterday,you_________have comethis morning. ( 全国 2) A.mayn’t
B.
can’t
C.
mustn’t
D.
needn’t
【简答题】It is necessary for you to have worked in this sector before.
【单选题】—Have you worked here since you graduated? —No, I ____________at a factory in Beijing for six years.
A.
would work
B.
have worked
C.
had worked
D.
worked
【简答题】学生注意转移快慢的标志是速度，速度受哪些方面的因素影响?
【简答题】If you have worked hard all day, you feel like this. t______
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