A.主配電板供電 B.分配電板供電 C.分配電板設(shè)獨(dú)立饋電線供電 D.主配電板單獨(dú)饋電線供電
A.0.1m B.0.2m C.0.4m D.0.15m
A.30 B.40 C.50 D.60