contour map of seam roof [矿业] 矿层顶板等高线图
coal seam roof 煤层顶板
The immediate seam roof 立即缝屋顶 ; 立即煤层顶板
standing seam roof system 直立缝屋面系统 ; 直立锁边屋面系统
coal seam-roof 煤层顶板
thick seam roof 厚煤顶板
seam-roof stability 煤层顶板稳定性
close to seam roof 邻近层顶板
Put focal point on coal seam roof and floor engineering geological characters.
重点阐述了煤层顶底板工程地质特性；
The stability of seam roof is one of the most important case that influences the safety of coal extraction.
煤层顶板的稳定性是影响煤层回采工作安全最重要因素之一。
Lithological characteristics of the seam roof are one of factors, which lead gas content to change partially.
煤层顶板岩性特征是影响瓦斯含量产生局部变化的因素之一。
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