1)one time cooling,一次冷却2)primary cooling water,一次冷却水3)primary coolant,一次冷却剂<能>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.
