准备巷道
numerical simulation research of wall rock stability of preparatory workings at chengchao iron mine
程潮铁矿采准巷道围岩稳定性数值模拟研究
the synthetic control of large-scale collapse of preparatory workings after submergence in chengchao iron mine
程潮铁矿淹井后采准巷道大面积坍塌的综合治理
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