预抽 meaning in Chinese

forepuming

Application on predrainage of seam in hebi no . 8 coal mine
预抽煤体瓦斯在鹤壁八矿的应用
Pre - evacuation protect atmosphere furnace
预抽真空保护气氛炉
Application of pdc bit in sihe mine coal seam predrainage drilling
钻头在寺河煤矿瓦斯预抽放钻井中的应用
Collapse characteristics research on roof rock strata with 3dec in full - mechanized caving mining
焦作矿区煤层瓦斯合理预抽期的研究
Teat on rational bore - hole parameters of gas pre - drainage by holes along seam in chengzhuang mine
成庄矿顺层钻孔预抽煤层瓦斯的合理钻孔参数试验

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