知識貝殼
知識貝殼
所屬欄目：制革專業(yè)英語
After chrome tanning it is common to allow excess chrome liquor to drain off the wet-blue,and to stand them in a damp condition for a day or more. Further fixation of chrome and setting of the wet-blue fibers occur. Where a flat leather is required,the we ......（本文共 11336 字 , 3 張圖） [閱讀本文] >>