1)single-event,一次爆破2)Shaft excavation by one blasting,一次爆破成井3)full section blasting,全断面一次爆破4)once,一次5)primary purification,一次精制6)one weighting,一次加重
用法例句
This study was carried on the primary purification of sodium chloride from flotation salt in potassium chloride production in Qinghai salt industrial company.
