... pillar method 柱式开采法 pillar method of stoping 柱式采矿法 pillar mining 留矿柱的采矿 ...
基于138个网页-相关网页
[矿业]
pillar method of working
... pillar line 煤柱（放顶）线 pillar method of working 柱式采矿法 pillar mining 煤柱回采 ...
基于12个网页-相关网页
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pillar method of stoping
pillar method of working
pillar working
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