(论文)中硬煤层瓦斯抽采定向长钻孔高效钻进工艺 Efficient Drilling Technology of Long Directional Borehole for Gas Drainage in the Medium Hard Coal Seam
本文档由 535625 分享于2015-07-12 16:00
(论文)中硬煤层瓦斯抽采定向长钻孔高效钻进工艺 Efficient Drilling Technology of Long Directional Borehole for Gas Drainage in the Medium Hard Coal Seam
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