允许速度不大于120km／h的线路,尖轨尖端轨距加宽,按不大于()递减至基本轨接头。 A.3‰B.4‰C.6‰D.8‰
允许速度不大于120km／h的线路,尖轨尖端轨距加宽,按不大于()递减至基本轨接头。
A.3‰
B.4‰
C.6‰
D.8‰
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