精密深孔钻孔工具
precision deep hole drilling tool
深钻孔应力测定仪
deep hole stress measurement device
大直径深长钻孔灌注桩
large-diameter bored cast-in-situ deep and long pi
中深孔凿岩爆破
Long and Medium Hole Drilling and Blasting
中深孔落矿
medium-length hole ore blast
中深孔结合浅眼爆破
mid-and-deep hole combining shallow hole balsting