單項(xiàng)選擇題
A.20mm B.15mm C.10mm D.5mm
A.65%~85% B.75%~95% C.85%~95% D.75%~85%
A.列車從鄰站開(kāi)出 B.列車接近預(yù)告 C.出發(fā)信號(hào)開(kāi)放 D.列車從本*站開(kāi)出
判斷題