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free silver 〔美國〕銀幣的自由鑄造。

free soil

To further reduce equivalent series resistance and improve long term reliability , the leads are then soldered with lead free silver solder 為了進一步的減少等效串聯阻抗和改善,長期的信賴度,引線是以無鉛銀焊錫來接焊

The historical origins and its far - reaching influence of the free silver movement 美國白銀運動的歷史淵源及其久遠影響

Two - direction pulse plating process for cyanide - free silver plating 雙向脈沖無氰鍍銀工藝研究