A.钢筋混凝土支柱 B.吸流变低压侧经吸上线与钢轨连接 C.铁桥栏栅 D.避雷器接地
A.27.5kV B.110kV C.220kV D.330kV
A.2000m B.1800m C.1600m D.1500m
A.50 B.100 C.150 D.200
