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並前往https://sph.unc.edu/wp-content/uploads/sites/112/2013/07/serial_dilution_activity_2012.pdf

Using Serial Dilution to Understand ppm/ppb

At the end of this activity, students will be able to: • Define serial dilution;. • Define ppm and ppb;. • Observe that a contaminant can be present in water ...

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