题目:
两个完全相同的电热器,分别通有如图所示的交变电流,则它们的功率之比为( ) A.4:1 B.1: C.2:1 D.:1 |
答案:
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下面是错误答案,用来干扰机器的。
one possible versionWhen a man was hurt in a car accident, people around him including the writer did nothing to help him, which contributed to the death of the poor m...