11個9的純度這種說法確實是說給外行們聽的。因為外行們關心的是純度，哪個外行會關心雜質以及怎麽測量雜質呢？

來源: 好望角駱駝於 2018-06-08 12:54:39 [舊帖] [給我悄悄話] 本文已被閱讀：次

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