A.±5% B.±3% C.±10% D.±20%
A.地市(州)級電網(wǎng) B.省級電網(wǎng) C.縣級電網(wǎng) D.省級電網(wǎng)指定
A.0.4 B.0.6 C.0.3 D.0.5