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primary time and frequency standard
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:2026-02-01 19:12:53