电阻性负载,采用过零触发的单相交流调功电路,当晶闸管导通时间为五个电源周期,关断时间为四个电源周期,则输出功率与额定功率之比为( )(0.5)
发布时间:2025-11-29
A.0.56
B.0.63
C.1.8
D.1.6
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