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The surface of the keys can be in gold plate, silver plate and nickel plate.
按键可以处理为镀金，镀银和镀镍等。
youdao
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Gold, silver and nickel plating of IC lead frame and package shell.
集成电路引线框架、封装壳体的镀金、镀银、镀镍、镀锡工艺。
youdao
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Gold, silver and nickel plating of IC lead frame and package shell.
集成电路引线框架、封装壳体的镀金、镀银、镀镍、镀锡工艺。
youdao