A.3 B.5 C.10 D.20
A.红灯 B.绿灯 C.灭灯 D.黄灯
A.5 B.10 C.2 D.3
A.5mm B.10mm C.20mm D.30mm
A.联锁操作有效，CTC操作无效 B.联锁操作无效，CTC操作有效 C.电务维修机操作有效
A.3mm B.4mm C.5mm D.10m
