采场覆岩裂隙发育及高位钻孔优化设计——以祁南煤矿34下2工作面为例
채장복암렬극발육급고위찬공우화설계——이기남매광34하2공작면위례
Fracture development of overlying strata and optimization of high position boring:with working face 34low 2 in Qinan mine as example
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