ppb (parts per billi

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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

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🎯 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：2026-09-21 08:50:18