眼前山铁矿转井下深部开采影响安全生产主要技术问题的可行性分析
안전산철광전정하심부개채영향안전생산주요기술문제적가행성분석
Analysis of Feasibility of Main Technical Issues of Impact of Transition from Open Pit to Deep Underground Mining of Yanqianshan Iron Ore Mine on Safety Production
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