选定晶闸管时,通常选额定电压为正常工作电压峰值的2-3倍。
A.正确
B.错误
正确答案是A
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Passage Three It is such an odd relationship betweenpeople and pandas. We are so fond of them that when the Chinese government lenta pair to the San Diego Zoo for six months,the number of visitors increasedsharply,and the