... 为一个采区服务的上山。 e 采区下山 district dip 为一个采区服务的下山。 e ...
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The research achievements were applied to the dip coal pillar area of No. 21 mining district, Qianqiu coal mine successfully.
经千秋煤矿21 采区下山煤柱区现场应用，效果良好。
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