如图所示电路中电源电压适当要使电铃和电灯同时有电流通过以下做法中正确的是a.闭合s2断开s1s3 b.断开s3闭合s1s2 c Template




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tomski如图所示电路中电源电压适当要使电铃和电灯同时有电流通过以下做法中正确的是a.闭合s2断开s1s3 b.断开s3闭合s1s2 c coloring