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PPM是什么意思? - 360问答 - 你问大家答
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PPM是什么意思? - 360问答 - 你问大家答
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http://wenda.so.com/q/1361503632069420?src=150
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Other Luggage, Bags Cases
2013-2-22 · 简单的说:1ppm=1mg/kg=1mg/L=1×10-6 常用来表示气体浓度,或者溶液浓度。 ppm是英文parts permillion的缩写,译意是每百万分中的一部分,即表示百万分 …
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