two stage purification是什么意思

用法例句

Realization of centrifuge purge cascade with additional feed;

附加供料离心净化级联的实现

Presents the determination of clean level for different process cleanzones and the material requirement of pharmaceutical cleanrooms, which are defined in ISPE guideline.

分析了制药系统污染物的来源与控制方法 ,介绍了ISPE规范中对不同工艺洁净区净化等级的划分和对制药洁净室材料的要求。