一般家庭的卫生间都要安装照明灯和换气扇.使用时,有时需要各自

一般家庭的卫生间都要安装照明灯和换气扇.使用时,有时需要各自独立工作,有时需要它们同时工作.评价下图电路,你认为符合上述要求的是(  )

答案

C    

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