平煤四矿庚20-21040掘进巷道探放水工程方案设计及实施
평매사광경20-21040굴진항도탐방수공정방안설계급실시
Water Detection, Water Release Plan Design and Practice of Driving Roadway on Ⅶ20-21040 Working Face in No.4 Coal Mine of Pingdingshan Tian'an Coal Industry Co. ,Ltd.
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