Applying long horizontal roof rock hole to drain the gas from adjacent seam and goaf is a new technique. In this paper, introduces the latest progress of this technique is introduced fully.
采用顶板岩层水平长钻孔抽放邻近层和采空区瓦斯是一项新技术，全面介绍了该技术研究的最新进展。
Applying long horizontal roof rock hole to drain the gas from adjacent seam and goaf is a new technique. In this paper, introduces the latest progress of this technique is introduced fully.
采用顶板岩层水平长钻孔抽放邻近层和采空区瓦斯是一项新技术，全面介绍了该技术研究的最新进展。
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