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international recommended values of standard frequencies
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international recommended values of standard frequencies
Encyclopedia
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时间频率计量
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international recommended values of standard frequencies
国际标准频率推荐值
由国际计量委员会(CIPM)推荐的一组电磁辐射标准频率值。为包含实际复现米定义和秒的次级表示在内的应用而设立。
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