问题
选择题
如图所示，开关都闭合时，灯泡L1与L2组成串联电路的是：[ ]
A.
B.
C.
D.
答案
答案：C
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如图所示，开关都闭合时，灯泡L1与L2组成串联电路的是：[ ]
A.
B.
C.
D.
答案：C
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