It is special important meaning that Deep - hole blasting With bottom Gap Charging is used to protect bottom rock from breaking, to decrease block ratio and to improve blasting efficiency.
深孔爆破孔底空隙装药在有效地保护底板岩层免遭破坏，减少大块率，提高爆破效率等方面均具有重要的意义。
2
After college she found work at a staffing agency but continued to take tidying jobs in the early mornings and late evenings, initially charging $100 per five-hour block.