passive frequency st
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passive frequency standards
英
[passive frequency standards]
美
[passive frequency standards]
中文释义
无源(被动)频率标准
单词分析
单词结构：
passive frequency standards
字母数：27
记忆提示
🎯 重点记忆：
- 单词拼写：passive frequency standards
- 核心含义：无源(被动)频率标准
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更新时间：2026-08-31 11:34:00