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[单选题]
行速度120km£¯h<v<160km p="" h线路上的道岔,密贴段牵引点有()及以上间隙时不能锁闭和接通表示。<="">
A.4mm
B.5mm
C.6mm
D.10mm
查看答案
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A.4mm
B.5mm
C.6mm
D.10mm
A.180°±2°
B.180°±3°
C.180°±5°
D.无限度
A.≤120km/h
B.>120km/h
C.≤160km/h
D.>160km/h
A.无限度
B.3~10mm
C.3~15mm
D.不得发生