1) underburden
下伏岩层
2) underlying rock
下伏岩石
4) undermass
下伏岩体
5) underlie coal seam
下伏煤层
1.
To solve the difficulties of mining the coal seams underlie the-115 main entry without destroying the main entry in the Quangou coal mine,the simulation analysis of surrounding rock movement regularities of the main roadway with the underlie coal seams mined was carried out.
针对泉沟煤矿要采出-115大巷下压煤,同时要保证上部的大巷正常使用的技术难点,进行了下伏煤层开采大巷围岩活动规律的模拟分析。
6) underlaying bed
下伏层
补充资料：扁扁伏伏
1.谓十分驯伏。
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