
Jewellery - Fineness of precious metal alloys (ISO 9202:2014); German and English version prEN ISO 9202:2016
出版:German Institute for Standardisation (Deutsches Institut für Normung)

專家解讀視頻
Jewellery - Fineness of precious metal alloys (ISO 9202:2014); German and English version prEN ISO 9202:2016
出版:German Institute for Standardisation (Deutsches Institut für Normung)
專家解讀視頻