知識(shí)貝殼
知識(shí)貝殼
There are numerous raw hide defects (Fig.3) that may reduce the value of the hide and consequently reduce the value of the leather made from it. These defects may be caused either by disease or external damage before the animal is slaughtered,or by incorr ......（本文共 8174 字 , 1 張圖） [閱讀本文] >>