medium-length hole blasting

• 中深孔爆破

medium-length hole blasting的用法和样例：

例句

1. The new method adopted roof presupporting,deep and medium hole blasting,LHD ore removal and tailings filling.
   该采矿方法采用采场预控顶技术，中深孔爆破，铲运机出矿，尾砂充填。