
Bs Iso 3160-2 - Watch-Cases And Accessories - Gold Alloy Coverings - Part 2: Determination Of Fineness, Thickness, Corrosion Resistance And Adhesion
出版:British Standards Institution

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Bs Iso 3160-2 - Watch-Cases And Accessories - Gold Alloy Coverings - Part 2: Determination Of Fineness, Thickness, Corrosion Resistance And Adhesion
出版:British Standards Institution
专家解读视频