题目内容
电阻性负载三相半波可控整流电路,整流变压器二次侧相电压的有效值为,当控制角a<30°时,整流输出电压平均值等于()。
2021-01-27
A.1.17cosa
B.1.17sina
C.1.41cosa
D.1.41sina
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