煤层顶板 meaning in English

cliff
clives
roof of coal seam
roofofcoalseam
seam top

Study and practice on supporting technique in coal seam roof
煤层顶板支护技术的研究与实践
Application of fuzzy synthesis evaluation to coal seam roof stability
模糊综合评判在煤层顶板稳定性评价中的应用
Evaluations method for coal seam - roof stability in geological survey stage
煤田地质勘探阶段煤层顶板稳定性评价方法
Application on gas drainage technology in high level drainage roadway of coal roof
煤层顶板高抽巷瓦斯抽放技术的应用
Main factors and mechanics influencing water inrush from roof snadstone
影响徐州矿区煤层顶板砂岩涌水的主要因素及机理

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