medium-length hole meaning in Chinese

中深孔

Practice of improving medium - length hole blasting effect in open pit mining
提高露天采矿中深孔爆破效果的实践
Application of bench caving with medium - length hole method in xinhua molybdenum mine
淘锡坑钨矿废水处理的试验研究
Application of bottom - initiated bomb in medium - length hole blasting in underground mine
地下中深孔孔底起爆弹应用实践
The application and effects of hole - bottom detonating in medium - length hole blasting
论中深孔爆破孔底起爆的实施和应用效果
Application of medium - length hole sublevel open stoping to the mining of thick part of high grade complex orebody
中深孔分段空场采矿法在高品位复杂难采厚矿段的应用