The determination of damage height of superincumbent stratum of goaf has immense meaning for safety and reasonable exploitation of coal seam underwaterbody, building and railway.
确定采空区上覆岩层破坏高度,对“三下”煤层安全、高效开采具有重要意义。
2
The kangaroo held the dog underwater at a dam near Melbourne and left deep lacerations across the 49-year-old owner's face and body when he risked his neck to save his pet.