龙口矿区近海厚冲积层下综放采煤防水煤岩柱的留设研究
룡구광구근해후충적층하종방채매방수매암주적류설연구
Fully Mechanizeh Caving Under Offshore Thick Alluvium in Longkou Mine-Study on design of Mining and Water Proof Coal Pillar
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