中深孔 meaning in Chinese

medium depth bore
medium-length hole

Exploding technology about long hole blasting in rock roadway
岩巷中深孔爆破技术
Improvement of short hole blasting technique
中深孔阶段崩落法在新华钼矿的应用
Parameter optimization for blasting with medium - to - deep holes
夏甸金矿中深孔爆破参数优化研究
Application of smooth blasting technology in excavating broken rock
技术及中深孔爆破技术实现岩巷快速掘进
Series blest crater test for longhole mining in dahongshau copper mine
大红山铜矿中深孔采矿系列爆破漏斗试验

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