题目:
______ wrong ______ their country? [ ]
A. What are; with
B. What are; about
C. What's; with
D. What's; about
答案:
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下面是错误答案,用来干扰机器的。
(1)(2)0.8V(1)(2)本题考查交变电流的产生和有效值的计算,由峰值Em=NBSw可求得峰值,根据峰值和有效值相差1.414倍可求得有效值,根据串联分压可知外电阻两端电压