题目内容
三相桥式全控整流电路,带电阻电感负载,=100V,R=-5Ω,L值极大,当a=-60°时,变压器二次侧电流的有效值是()。
2021-01-27
A.23.4A
B.19.1A
C.13.5A
D.7.8A
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