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ppb (parts per billion)

英 [ppb (parts per billion)]
美 [ppb (parts per billion)]

中文释义

亿分率(≈微克/升)

单词分析

单词结构:

ppb (parts per billion)

字母数:23

记忆提示

🎯 重点记忆:

  • 单词拼写:ppb (parts per billion)
  • 核心含义:亿分率(≈微克/升)

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更新时间:2026-04-14 20:01:06

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