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40cm等于多少米
更新时间: 2020-07-07 00:00:00  

因为1米等于100厘米,所以40厘米等于0.4米;

厘米是一个长度计量单位,等于一米的百分之一;

国际单位制的长度单位“米”起源于法国,1790年5月由法国科学家组成的特别委员会,建议以通过巴黎的地球子午线全长的四千万分之一作为长度单位“米”,1791年获法国国会批准。

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