补孔深度比例
Depth proportion of perforaation
中心孔腔形成机制
mechanism of center-crack occurrence
中心孔磨床
center hole grinder
center hole grinding machine
中心孔进油
oil-trapped inside central hollow rotor
inlet oil of center hole
中心孔变形试验
plate-loading test with a central hole
中深孔凿岩爆破
Long and Medium Hole Drilling and Blasting
中深孔落矿
medium-length hole ore blast
medium-length hole minimg
Medium-length hole caving
中深孔结合浅眼爆破
mid-and-deep hole combining shallow hole balsting
中深孔和浅孔联合爆破
medium-length and post hole joint blasting
中深孔光爆
medium-deep smooth blasting