coal seam with gangue and surrounding rocks
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In the coal seam, there are gangue and rocks above and below the coal seam. During mining, the gangue enters the coal.
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帮煤层中有煤矸石、煤层上下方的石块，开采时煤矸石进入煤中
图片类型
Default
In the coal seam, there are gangue and rocks above and below the coal seam. During mining, the gangue enters the coal.
帮煤层中有煤矸石、煤层上下方的石块，开采时煤矸石进入煤中