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梯段掘进爆破法
meaning in English
heading and bench blasting
Related Words
掘凿新井
爆破巨砾
梯道
船尾梯
梯己
螺旋梯梯井
梯井
梯车
防火梯
梯工
梯段净高
梯段掘进
梯段开采
梯段开采法
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