1) hard and integral crust plate
坚硬板块
2) The hailstone is strong and hard.
雹块坚硬
3) hard roof
坚硬顶板
1.
Numerical Simulation of hard roof processing step;
坚硬顶板处理步距的数值模拟
2.
Numerical simulation of moving features of hard roof with three-dimensional discrete element method and nonlinear dynamic analysis;
坚硬顶板运动特征的数值模拟及非线性动力学分析
3.
Numerical simulation study with 3DEC on impacted movement of hard roof in manless working face extraction;
无人工作面开采坚硬顶板冲击运动的3DEC数值模拟研究
4) hard floor
坚硬底板
1.
Analysis on mechanics of rock burst in hard floor under tectonic stress
构造应力下坚硬底板冲击地压机理分析
5) hard top-coal(roof)
坚硬顶煤(板)
6) hard roof and hard floor
坚硬顶底板
补充资料：综采放顶煤
综采放顶煤：厚煤层煤炭开采技术之一。把原来分层开采的煤炭，一次采完。方法是，在煤层底部按传统方法开采，使上面的煤炭在矿压的作用下，自动落下来。
说明：补充资料仅用于学习参考，请勿用于其它任何用途。
参考词条