coal uncovering
短语词组
- coal seam uncovering 揭煤
- coal -seam uncovering 煤層剝露
- exposure degree during coal uncovering 揭煤暴露麪麪積
- rock cross -cut coal uncovering 石門揭煤
- uncovering coal 揭煤
- rise entry uncovering coal 上山揭煤
- uncovering coal plane 煤層裸露麪
- rapid uncovering coal 快速揭煤
- vertical shaft uncovering coal 立井揭煤 返回 coal uncovering