A.1 B.2 C.4 D.6
A.負57VDC~負40VDC B.負55VDC~負36VDC C.負58VDC~負41VDC D.負58VDC~負38VDC
A.單盤損壞 B.光模塊損壞 C.數據業(yè)務配置錯誤 D.中繼電纜損壞