GB T 38020.1-2019 表壳体及其附件 金合金覆盖层 第1部分：一般要求.pdf

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GB T 38020.2-2019 表壳体及其附件 金合金覆盖层 第2部分：纯度、厚度、耐腐蚀性能和附着力的测试.pdf

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