A.0.318Vm B.0.5Vm C.0.636Vm D.0.707Vm
A.1% B.1.5% C.2% D.2.5% E.3%
A.濾波電容器漏電 B.變壓器二次側(cè)短路 C.電路工作正常 D.有一二極管開路