Unverified80% confidenceDecision RuleTime unknown
合金镀层胸针看电镀层次:镀真金(3微米以上)比普通电镀耐氧化,出汗多或需长期佩戴应避开普通铜合金电镀款,铜氧化会发黑并可能致敏
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80%
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Long-term
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