top heading excavation

基本解释上导洞开挖

网络释义

1)top heading excavation,上导洞开挖2)excavation of pilot tunnel,导洞开挖3)Three guide holes,三导洞开挖4)Multi-pilot-cavity excavation,多导洞开挖5)heading and bench excavation,导洞与台阶开挖6)tunnel-door digging,洞门开挖

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