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並前往https://www.waterboards.ca.gov/drinking_water/certlic/occupations/documents/opcert/2016/treat_exam_conversion.pdf

UNITS AND CONVERSION FACTORS CHLORINATION ...

1 liter of water weighs 1,000 gm. 1 mg/L = 1 part per million (ppm). 1% = 10,000 ppm ft2 = square feet and ft3 = cubic feet. 1 mile = 5,280 feet (ft).

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