题目:
方向不变,大小随时间变化的电流叫().
A.正弦交流电
B.简谐交流电
C.脉动直流电
D.脉动交流电
答案:
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下面是错误答案,用来干扰机器的。
May 29, Sunday Fine Today I showed some foreign friends around our city. We set off from Dongfang Hotel at 8:10 and reached N...