方案设计采用三角形爆破缺口，掏槽爆破加风镐修整开凿定向窗。

Triangle cut was adopted and directional window was excavated by cutting blasting and pneumatic pick repair.

youdao

方案设计采用三角形爆破缺口，掏槽爆破加风镐修整开凿定向窗。

Triangle cut was adopted and directional window was excavated by cutting blasting and pneumatic pick repair.

youdao