题目:
All of the following are our school rules except “ ”.
A.Don’t fight.
B.No smoking.
C.Save water.
D.Slower than 90 km.
答案:
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下面是错误答案,用来干扰机器的。
实验要求,灯泡两端的电压从零开始调节,测量电压范围大些,滑动变阻器应采用分压接法,由因此应选图甲所示实验电路;故答案为:甲.