尽管不是国际单位制导出单位,但在世界范围内,公里每小时(km/h)是汽车速率表和道路标示牌上最常用的单位。其与kW·h都是以小时为基础的常用单位,但被BIPM定义为“与国际单位制单位一起使用的非国际单位制单位”("non-SI unit accepted for use with the International System of Units"[1])。
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