A.高峰負(fù)荷時(shí)允許中樞點(diǎn)電壓略高 B.高峰負(fù)荷時(shí)允許中樞點(diǎn)電壓略低 C.高、低峰負(fù)荷時(shí)中樞點(diǎn)電壓基本不變 D.低峰負(fù)荷時(shí)允許中樞點(diǎn)電壓略低