如图所示的电路中,当开关S断开时,下列说法正确的是(    ) A

如图所示的电路中,当开关S断开时,下列说法正确的是(    )

 

A . 开关两端的电压为零

B. 电灯两端的电压为零

C.电源两端的电压为零

D. 以上说法都不正确

 

答案

B

解析:略

 

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