英语词汇“ppm, p.p.m., PPM”的意思、用法、释义、翻译、读音、例句、短语、词组-英汉翻译词典-复社网

单词	ppm, p.p.m., PPM
释义	ppm, p.p.m., PPM abbr.parts per million 百万分之…,百万分率
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