| RfD |
A reference dose is an estimate of the amount of a chemical that a person can be exposed to on a daily basis that is not anticipated to cause adverse health effects over a person's lifetime.
출처: www.cdphe.state.co.us/lr/Water/WaterDefinitions.ht...
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| RfD |
Begun in 1896 as an experiment in West Virginia, RFD brought daily mail delivery to farmers and others living outside urban areas.
출처: www.usps.com/history/anrpt97/intro_glossary.htm
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