4 Preservation of Hides and Skins
工業科技

        In many cases it is impossible to put fresh hides and skins into leather production within hours of slaughter. Usually it takes 2 to 25 weeks to collect,store,market,transport hides and skins from slaughterhouse to tannery workshop. In this very period,hi......（本文共 11762 字）     [閱讀本文] >>