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【单选题】
晶闸管整流是通过改变()来实现调压的。A.
交流电压的大小
B.
触发角
C.
导通角
D.
通电时间
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A.
知识即美德
B.
“吾爱吾师，吾尤爱真理”
C.
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D.
强调人的价值、人的决定作用
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