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

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