The causes of tarnishing gold and silver - plated connectors were studied respectively.
分别探讨了接插件镀金和镀银层变色的原因.
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Bright tin electrodeposits on copper wire are susceptible to tarnishing.
铜线材经光亮镀锡后易产生腐蚀变色.
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Do they not realize their foolhardiness and which they are tarnishing the Republic's image?
他们难道不知道自己的行为不但愚蠢,也会损害新加坡的形象?
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The anti - tarnishing experiments can be taken to confirm a certain alloy's anti - tarnishing capability.
银合金的特点是容易发生硫化变色,通过 抗 变色试验可以确定合金的 抗 变色性能.
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