由於白銀曆史上相對便宜,工程師設計時就高配用了白銀
其實多數應用沒必要!幾十年前工業控製接觸器繼電器那觸點都是純銀的,現在不用了
由於白銀曆史上相對便宜,工程師設計時就高配用了白銀
其實多數應用沒必要!幾十年前工業控製接觸器繼電器那觸點都是純銀的,現在不用了
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