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如图所示,要使灯泡L1和L2组成并联电路,应( ) [Failed to download image : http://qbm-images.oss-cn-hangzhou.aliyuncs.com...
题目内容:
如图所示,要使灯泡L1和L2组成并联电路,应( )
[Failed to download image : http://qbm-images.oss-cn-hangzhou.aliyuncs.com/QBM/2016/4/15/1574834213552128/1574834253766656/STEM/a433cad983e64692ae8db2a646162d8e.png]
A. 只闭合S2 B. 只闭合S3 C. 只闭合S1和S3 D. 只闭合S2和S3
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