Optimizing roadway arrangement way unceasingly, reducing the tunnel drivage ratio is an important task in the mine mining design process.
不断优化巷道布置方式，降低巷道掘进率，是矿井开采设计过程中的一项非常重要任务。
Optimizing roadway arrangement way unceasingly, reducing the tunnel drivage ratio is an important task in the mine mining design process.
不断优化巷道布置方式，降低巷道掘进率，是矿井开采设计过程中的一项非常重要任务。
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