primary reference material

英 [primary reference material]
美 [primary reference material]

中文释义

基本标准物质

单词分析

单词结构：

primary reference material

字母数：26

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🎯 重点记忆：

  • 单词拼写：primary reference material
  • 核心含义：基本标准物质

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更新时间：2025-12-08 20:17:08