多伦协鑫煤矿1702-1工作面水体下综放开采安全煤岩柱的留设研究
다륜협흠매광1702-1공작면수체하종방개채안전매암주적류설연구
Research on Safety Coal and Rock Pillar Design for Full-mechanized Caving Mining under Water Body in 1702-1 Face of Duolunxiexin Colliery
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