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

Measurement Units and Concentration Analogies 1 ppm = ...

1 microgram/kilogram (µg/kg) = 1 ppb. 1 microgram/liter (µg/l) = 1 ppb. 1 nanogram/gram (ng/g) = 1 ppb. 1 ppb Analogies. 1 silver dollar in a roll stretching ...

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