[KongchangAI]
Unverified90% confidenceFactTime unknown

925银指含银量92.5%,其余7.5%多为铜以增加硬度,属国际通用标准银;S990/S999为足银,更软更纯,抗氧化性并不优于925银反而更易变形

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90%
Confidence
Long-term
Relevance
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