顶板双位钻孔瓦斯抽采技术在无尾巷回采工作面瓦斯治理中的应用
정판쌍위찬공와사추채기술재무미항회채공작면와사치리중적응용
Application of Gas Drainage Technology by Roof Double-position Boreholes in Gas Control of Working Face without Tailing Gate
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