题目内容

4

A. Excellent.
B. Just so-so.
C. Very bad.
D. Fine.

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6

A. Very happy.
B. Very funny.
C. Very excited.
D. He didn’t enjoy himself at all.

8

A. He has a fever.
B. He is not strong enough.
C. He has a headache.
D. As long as he wants.

换路瞬间只有电容上的电压和电感中的电流不能发生跃变，其它各电量都可发生跃变

A. 对
B. 错

在暂态电路中，换路瞬间，下列说法正确的是（）。

A. 电阻电流不能突变
B. 电容电压不能突变
C. 电容电流不能突变
D. 电阻电压不能突变