primary frequency standard

英 [primary frequency standard]
美 [primary frequency standard]

中文释义

一级频率标准;基本频率标准

单词分析

单词结构：

primary frequency standard

字母数：26

记忆提示

🎯 重点记忆：

  • 单词拼写：primary frequency standard
  • 核心含义：一级频率标准;基本频率标准

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更新时间：2026-01-31 04:58:04