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音苻A为什么要等于440hz
更新时间: 2020-07-05 00:00:00  

音高用一秒钟的振动数来表示。频率次数多者音高,频率次数少者音低。将每秒振动440次的声音定为“a”,是目前国际通用的标准音。 a=440赫兹,是恒定不变的。

关键词: 为什么 等于 440hz

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