由于白银历史上相对便宜,工程师设计时就高配用了白银
其实多数应用没必要!几十年前工业控制接触器继电器那触点都是纯银的,现在不用了
由于白银历史上相对便宜,工程师设计时就高配用了白银
其实多数应用没必要!几十年前工业控制接触器继电器那触点都是纯银的,现在不用了
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