broken seam
常见例句
- This paper approves the importance in producing minimum vibration energy during the broken of stiff sandstone roof in working of stress releasing seams by caving method.
论文证实了用垮落法开采卸压层使坚硬砂岩顶板折断时产生的振动能为最小的要义。 - On the basis of industry test, this paper analyses mining feasibility of applying roadway caving method and caving broken mechanism in high gas steeply indined medium coal seams.
在工业性试验的基础上 ，分析了在高瓦斯急倾斜中厚煤层中应用巷道放顶煤法开采的可行性和顶煤的破碎机理。 返回 broken seam