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types of opening exploration engineering
expl.
坑探的类型
坑探工程按其所在位置与地面的关系,可分为地表工程和地下坑道。地下坑道根据其中心线与地表水平面交角的不同,又分为水平坑道、垂直坑道和倾斜坑道三种
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