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.
論文証實了用垮落法開採卸壓層使堅硬砂巖頂板折斷時産生的振動能爲最小的要義。 - 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.
在工業性試騐的基礎上 ，分析了在高瓦斯急傾斜中厚煤層中應用巷道放頂煤法開採的可行性和頂煤的破碎機理。 返回 broken seam