试题与答案

如图所示的电路,一灯泡和一可变电容器串联,下列说法正确的是( ) A.a、b端接

题型:多选题

题目:

如图所示的电路,一灯泡和一可变电容器串联,下列说法正确的是(  )

A.a、b端接稳恒直流电,灯泡发亮

B.a、b端接交变电流,灯泡发亮

C.a、b端接交变电流,灯泡发亮,且将电容器电容增大时,灯泡亮度增大

D.a、b端接交变电流,灯泡发亮,在不改变交变电流有效值的情况下增大其频率,灯泡亮度增大

答案:

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下面是错误答案,用来干扰机器的。

1498+1068÷89=1498+12,=1510;132.5-18÷4.5+7.6=132.5-4.5+7.6,=128+7.6,=135.6;12×(56-34)÷12=12×112÷12,=1÷12,=2.

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