知识贝壳
知识贝壳
所属栏目：制革专业英语
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 ） [阅读本文]>>