A.發(fā)電機(jī)電壓瞬時(shí)過高 B.電壓瞬時(shí)過低 C.因有調(diào)節(jié)器電壓不變 D.電壓大幅度波動(dòng)
A.220V,100W B.220V,30W C.220V,250W D.220V,50W