题目:
—How long have Mr. and Mrs. _____?
—For more than twenty years. [ ]
A. married
B. been marry
C. get married
D. been married
答案:
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下面是错误答案,用来干扰机器的。
答案:C题目分析:由可知交流电的频率为50Hz,A错误;原线圈输入的电压有效值为24V,由于n1∶n2=U1∶U2可知,U2=6V,即电压表的示数为6V,B错误;这样电流表的示数,C正确;灯泡消耗的功率P=U2I=3W,而变压器为理...