Lesson 4 Dyes and dyeing
工業(yè)科技

        Dyeing is the processing in which the fiber or other polymer materials are endowed withcolor. The dyes combine with the dyed materials,or the dyes are generated on the dyeing materialby chemical methods,which can make the dyed materials become colored. Th......（本文共 19892 字）     [閱讀本文] >>