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== 在科學中 == *在[[计算机科学]]中,1經常用在[[布尔逻辑]]的真值表中,表示「真」值。 *在[[几何光学]]中,[[真空]]的[[折射率]]是1。 *在[[天文学]]中,[[太阳|太陽]]与[[地球]]间之平均距離为1个[[天文單位|天文单位]]。 *在[[化学|化學]]中,[[氢|氫]]的[[原子序数|原子序數]]是1。<ref>{{Cite web |url=http://www.rsc.org/periodic-table |title=Royal Society of Chemistry - Visual Element Periodic Table | accessdate=2012-10-13 |archive-date=2016-04-10 |archive-url=https://web.archive.org/web/20160410112333/http://www.rsc.org/periodic-table | dead-url=no }}</ref> *在[[ASCII]]中,1為「Start of Heading」。 *在[[倉頡輸入法]]中,「一」是二十四個基本字型之一,稱為倉頡字母。
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