片语
Purification of chemical substances物质的提纯
chemical water purification化学凈水
chemical separation and purification化学分离和提纯
chemical purification method化学凈化法
improvement of chemical purification technology化学凈化技术的改进
chemical purification plant化学凈化厂
physico-chemical purification物理化学凈化
chemical purification process化学凈化法
solvent extraction chemical purification溶剂萃取