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SI基本単位の再定義 (2019年) - Wikipedia
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January 17, 2021 at 02:48:55 GMT+9 * ·
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https://ja.wikipedia.org/wiki/SI%E5%9F%BA%E6%9C%AC%E5%8D%98%E4%BD%8D%E3%81%AE%E5%86%8D%E5%AE%9A%E7%BE%A9_(2019%E5%B9%B4)
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