... retreating longwall 后退式长壁开采 retreating mining 后退式开采 retreating work 后退式开采 ...
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retreating mining method 后退式开采法
sublevel retreating mining 分段后退式
retreating g mining 后退式开采
mining retreating 后退式开采法
longwall advancing mining retreating 长壁后退式回采
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The paper discusses the application and the effects of the coal mining method with retreating-longwall flexible shield support in steeply-inclined coal seam.
叙述了走向长壁后退式柔性掩护支架采煤法在急斜煤层中的应用及效果。
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