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長度、質量和時間 在只限於力學量和電學量的組織時,在國際制中,用m、kg和s分別表示長度、質量和時間三個基本量的組織.其他力學量的組織便可用這三個基本組織的組合來表示.例如速度的組織可用m/s表示 F=ma
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