Two - stage chromate reduction has been used at several plants.一些厂已采用两段铬酸盐还原法.The potassium chromate method is one regular method to determine COD.重铬酸钾法是测定化学需氧量的常规方法.Cr - Fe waste residue is derived from production of ch...
The potassium chromate method is one regular method to determine COD.重铬酸钾法是测定化学需氧量的常规方法.It's a two - component, chromate free, epoxy polyamide adduct shop primer especially designed.是一种不含铬的双组份环氧聚酰胺加成物的车间底漆.Two - sta...