longwall retreating
... retort 蒸馏罐;马弗炉 retreating longwall 后退式长壁开采 retreating mining 后退式开采 ...
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... 后退式回采:bring back 后退式长壁开采:longwall retreating 后退回采:back coming ...
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走向长壁后退式开采工作面用风帘控制粉尘和瓦斯简单易行,能够解决生产中的实际问题。
It's easy and useful to control dust and gas with wind-cloth curtains in the bringing back long wall face.
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