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 content of vitamin PP tomato ranks first in fruits and vegetables, vitamin PP's role is to protect the skin, promote the formation of red blood cells.
番茄中维生素pp的含量居果蔬之首，维生素pp的作用是保护皮肤，促进红细胞的生成。
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。
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