drilling continuous drainage technology
...钻孔连续抽放技术；水力冲孔与压风吹孔技术 [gap=674]ywords: large inclination thick coal seam in; Back tu plan; Huainan mining area; Drilling continuous drainage technology; Hydraulic punching and pressure the wind hole technology ..
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drilling continuous drainage technology
钻井连续排水技术
以上为机器翻译结果，长、整句建议使用 人工翻译 。