知識(shí)貝殼
知識(shí)貝殼
所屬欄目：制革專業(yè)英語
Sheepskins and some of other small skins contain large amounts of natural fat. As already mentioned,sheepskins contain up to 30% fat which has to be removed. Excessive amounts of fatty substances in the skin may interfere with uniform penetration of tanni ......（本文共 10677 字 ） [閱讀本文] >>