hole springing meaning in Chinese

钻孔底扩大

Horizontal hole springing and rock breaking - out blasting
平孔药壶坍塌爆破技术
Research on the application of large diameter deep - hole springing blasting
大直径孔药壶爆破技术应用研究
Application of the deep - hole springing blasting in wulongquan limestone mine
深孔药壶爆破技术在乌龙泉石灰石矿的应用
Research on charge weight of first hole - springing explosion in deep - hole springing blasting
深孔药壶爆破初次爆扩用量药研究
Comprehensive application of horizontal - hole springing blasting and shear - hole springing blasting
平孔药壶与竖孔药壶爆破技术的综合应用

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