medium length hole的用法和樣例：
例句
- Test Research on Parameter Optimization for Long and Medium Hole Drilling and Blasting in Sanxin Co.
三鑫公司中深孔鑿巖爆破參數優(yōu)化與試驗研究。 - As a result,the short hole shrinkage method with flat bottom structure was employed to mine the stope firstly,then stoping ore pillar by medium length hole caving method.
后溝金礦采用平底結構淺孔留礦法先采礦房，后用中深孔崩落法回采礦柱，經(jīng)兩年多的生產(chǎn)實(shí)踐，取得較好的技術(shù)經(jīng)濟指標。
