roof condition meaning in English
顶板状况
Examples
- The support designing analyses applying in big picking high and hard roof condition
坚硬顶板下综采准备工作面扩帮立架施工工艺 - Practices on bolt , mesh , anchor and beam support in coal drift under unstable roof condition of cataclastic rock mass
不稳定顶板煤巷锚网索梁支护实践