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Lesson 1 Introduction
工業(yè)科技

        Coating,bonding and sealing are techniques that humankind has used for many thousands ofyears. For a long time,only natural resins,oils and fats were used for these purposes.Shellac,a natural resin secreted by the scaly lac insect,has been used in India f......(本文共 5303 字)     [閱讀本文] >>

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