coal seam with gangue and surrounding rocks
圖片類型
Default
提示詞
點擊複製
In the coal seam, there are gangue and rocks above and below the coal seam. During mining, the gangue enters the coal.
提示詞
點擊複製
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
圖片類型
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