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【简答题】
A sample of wastewater is estimated to have a BOD of 200 mg/L. 1) What dilution is necessary for this BOD to be measured by the usual technique? 2) If the initial and final dissolved oxygen of the test thus conducted is 9.0 and 4.0 mg/L, and the dilution water has a BOD of 1.0 mg/L, what is the dilution?
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