
JEWELLERY - COLOURS OF GOLD ALLOYS - DEFINITION, RANGE OF COLOURS AND DESIGNATION (ISO 8654:2018)
出版:Norwegian Standards (Norges Standardiseringsforbund)

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JEWELLERY - COLOURS OF GOLD ALLOYS - DEFINITION, RANGE OF COLOURS AND DESIGNATION (ISO 8654:2018)
出版:Norwegian Standards (Norges Standardiseringsforbund)
專家解讀視頻