A.電池保險(xiǎn)斷 B.指示燈壞 C.KM2吸合 D.RD1斷
A.KM1常閉點(diǎn)接觸不良 B.KM2常閉點(diǎn)接觸不良 C.RD1交流保險(xiǎn)斷 D.KM1常開點(diǎn)接觸不良
A.48V B.110V C.220V D.380V