... bore diameter 内径 ; 膛径 ; 孔径 ; 轴孔直径 bore mining 溶液采矿 well bore 井身 ...
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On-the-spot investigation was made on the basic parameters of gas drainage in drivage roadway in Huainan Coal Mining Area, and reasonable arrangement range of rib bore-holes an...
现场考察了淮南矿区掘进巷道瓦斯排放的基本参数，确定了巷帮钻孔的有效布置范围和合理抽放时间。
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