上尾巷埋管抽放技术在"三软"厚煤层综采放顶煤工作面的应用
상미항매관추방기술재"삼연"후매층종채방정매공작면적응용
Application of Draining- out Gas by Burried Pipe at Topend Road of Fully Mechanized Coal Face in "Three Soft" Thick Coal Seam
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