屯兰矿煤巷掘进工作面防止瓦斯异常涌出技术措施及安全防护措施的研究
둔란광매항굴진공작면방지와사이상용출기술조시급안전방호조시적연구
Study on the Technical Measures for Preventing Unusual Gas Emission and Safety Measures Adopted on the Tunneling Faces of Tunlan Coal Mine
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