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並前往https://www.llojibwe.org/drm/environmental/content/concentrations.pdf

Measurement Units and Concentration Analogies 1 ppm ...

1 milligram/kilogram (mg/kg) = 1 ppm. 1 milligram/liter (mg/l) = 1 ppm ... 1 ppm = 1,000 ppb = 1,000,000 ppt. Parts Per Billion (ppb).

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