roof coal meaning in Chinese
留顶板煤
Examples
- Talking about spreading combined mining roof coal technology at gentle inclined coal seam
在缓倾斜煤层中推广综采放顶煤技术浅析 - Numerical simulation of spontaneous combustion process in goaf areas by fully - mechanized and caving roof coal
综放面采空区遗煤自然发火过程动态数值模拟