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贵金属覆盖层饰品
Adornment with precious metal coating
价格：￥0.00
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贵金属饰品质量测量允差的规定
Provision of permissible errors for measurement of precious metals adornment mass
价格：￥0.00
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首饰 金覆盖层厚度的规定
Jewellery-the provision of gold coatings tickness
价格：￥0.00
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首饰 银覆盖层厚度的规定
Jewellery-the provision of silver coatings tickness
价格：￥0.00
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首饰 金、银覆盖层厚度的测定 X射线荧光光谱法
价格：￥0.00
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