英语词汇“ppb, ppb.”的意思、用法、释义、翻译、读音、例句、短语、词组-英汉翻译词典

单词	ppb, ppb.
释义	ppb, ppb. abbr.parts per billion [美国英语]十亿分率,十亿分之…
随便看	three-level laser configuration three-level laser material three level laser rod three-level laser rod three-level light emitter three level maser three-level maser three-level master three-level memory three-level package three-level quantization three-level record three level recording three-level recording three level return system three-level return system three levels three-levels three level section three-level section three levels of prevention three levels of social prevention three-level solid laser three level solid state quantum amplifier three-level structure

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