题目内容
如图所示的电路中,电源内阻不计,三个小灯泡完全相同。开始时K 1闭合, K 2打开。下列说法正确的是( ) 
2021-07-21
A.K2闭合前灯泡丙不亮
B.K2闭合后灯泡甲变暗
C.K2闭合后电容器的带电量减少
D.K2闭合后电容器的带电量增加
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