long face是什么意思

用法例句

Different from the delaying slope coal seam, there is difficultly supporting particular complexity in the T-junctions of the fully mechanized top coal caving longwall face in pitched thick seams because of existence of triangle top coal in tail T-junction and triangle floor in head T-junction.

与缓倾斜煤层综放工作面不同,大倾角长壁综放工作面因沿倾斜方向布置,会出现下端头底三角、上端头顶三角煤不易支护的特殊复杂性。