On the first magnetic switch material, using PVDF, PP material, the material benefits that can be resistant to acid and alkali sites;
首先关于磁性开关的材质，采用PVDF、PP材质，这种材质的好处就是可以耐强酸、强碱场所；
The investigation was made on first quality index of raw material (PP) for producing fine PP fiber in domestic factories.
通过对国内目前所需细旦丙纶原料（ 聚丙烯）的质量指标进行调研，制定出相应的质量指标体系。
Projection pursuit (PP), improving genetic algorithm (IGA) and vector are used as a chief means of evaluating indicator and analyzing datum for the first time.
在层次分析法中又引入了向量概念来解决判断矩阵不具有满意的一致性时的修正问题；
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