常見例句雙語例句The determination of damage height of superincumbent stratum of goaf has immense meaning for safety and reasonable exploitation of coal seam under water body, building and railway.確定採空區(qū)上覆巖層破壞高度,對(duì)“三下”煤層安全、高傚開採具有重要意義。chazidian.com 返回 superincumbent stratum