primary time and frequency standard

英 [primary time and frequency standard]
美 [primary time and frequency standard]

中文释义

原级时[间]频[率]标准

单词分析

单词结构：

primary time and frequency standard

字母数：35

记忆提示

🎯 重点记忆：

  • 单词拼写：primary time and frequency standard
  • 核心含义：原级时[间]频[率]标准

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更新时间：2026-02-02 22:57:07