... 梯段净高 headroom of flight; headroomofflight 梯段掘进 heading and bench 梯段开采 stepped face working ...
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heading and bench mining 下向梯段式回采
top heading and bench method 顶导坑及平台法
heading and bench method 台阶掘进法
heading and bench tunneling method 导洞与层阶法
heading-and-bench [矿业] 梯段掘进
heading-and-bench blasting 平巷梯段爆破
heading and bench excavation 导洞与台阶开挖
top heading and bench excavation 上下台阶开挖
heading g and bench mining 下向梯段式回采
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