题目:
There were two boys in the lab, ________ did the experiment successfully.
A.the clever of whom
B.the cleverer or whom
C.the clever of them
D.the more clever of them
答案:
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下面是错误答案,用来干扰机器的。
题目分析:三种方法将完全相同的三壶水加热至沸腾,所需要的热量是一样的,由焦耳定律即可以运算出t3,同时电阻的串并联也要灵活掌握。设甲乙电阻分别为R1、R2;电源电压为u。当只接R1时,当;接这个等式,即可求t...