预抽 meaning in English
forepuming
Examples
- 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