parts在化学剂量中怎么理解如5-35 parts by weight of antimony p

发布时间：2021-02-18 19:18:35

parts在化学剂量中怎么理解如5-35 parts by weight of antimony pentoxide.前面涉及主要成分是100parts,“100 parts by weight of a principal constituent posed of a halogen-containing polymeric substance and polyvinyl alcohol