李嘴孜煤矿急倾斜厚煤层工作面采空区自然发火预防技术
리취자매광급경사후매층공작면채공구자연발화예방기술
Prevention Technology of Goaf's Coal Spontaneous Combustion in working Face of Steep-inclined and thick Coal Seam in Lijiazui coal mining
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