箱涵顶进穿越铁路路基时,应( )开挖和顶进。A.在列车运行间隙 B.连续 C.快速 D.慢速

作者: rantiku 人气: - 评论: 0
问题 箱涵顶进穿越铁路路基时,应( )开挖和顶进。
选项 A.在列车运行间隙 B.连续 C.快速 D.慢速
答案 A
解析 在列车运行间隙或避开交通高峰期开挖和顶进;列车通过时,严禁挖土作业,人员应撤离开挖面。故答案选A

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