软岩巷道的支护结构应有“先柔后刚”的特性，一般需要。 -题库考试答案搜索网

软岩巷道的支护结构应有“先柔后刚”的特性，一般需要。

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2021-09-02 15:23

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标签：联大河南理工大学井巷工程

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