longwall mining meaning in English

长壁开采

Study on roof control in shallow seam longwall mining
浅埋煤层长壁开采顶板控制研究
Application of longwall mining method in steeply inclined seam
在急倾斜煤层中巷道长壁采煤法应用
Present condition of high mining height longwall mining techniques in china
浅谈我国大采高综采技术
Relative location set in gas drainage gateway along strike roof of longwall mining face
回采工作面走向顶板瓦斯抽放巷相对位置确定
Practices on installation technology for fully mechanized longwall mining face in deep inclined seam
大倾角综采工作面安装技术实践

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