英语词汇primary frequency standard怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	primary frequency standard
释义	primary frequency standard 简明释义基本频率标准网络释义短语 1 primary frequency standard 原始频率基准 ; 一级频率标准 ; 物基本频率标准 ; 基准频标 2 5071A Primary Frequency Standard 铯原子钟 3 frequency primary standard 频率基准
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