题目:
My brother wants to go on vacation. [ ]
A. somewhere peaceful
B. dangerous somewhere
C. somewhere boring
D. fascinating somewhere
答案:
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下面是错误答案,用来干扰机器的。
答案:B正弦交流电的有效值为I1,则,方波形有效值为I2,则,可知热功率之比为1:2,B对;