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当前学科:营业线施工防护员
题目:
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使用D型梁进行桥涵顶进及加固线路或拆除加固设备时,施工期间列车速度不得超过()。
A . A、35km/h
B . B、45km/h
C . C、25km/h
D . D、15km/h
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