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並前往https://apps.sfwmd.gov/sfwmd/SFER/2017_sfer_final/front_matter/conversion.pdf

CONVERSION OF UNITS OF MEASUREMENT

1 mL = 0.0338 oz millimeter mm inches. 1 mm = 0.0394 inches nanograms ng ... parts per billion ppb. 1 ppb = 1 μg/L nanogram per liter ng/L parts per trillon.

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