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用于侧向通过列车,速度50km/h以上至80km/h的单开道岔,道岔辙叉号数不得小于()。

发布日期:2021-03-22

用于侧向通过列车,速度50km/h以上至80km/h的单开道岔,道岔辙叉号数不得小于()。
A

9号

B

12号

C

18号

D

30号

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