Environmental Science e-Book's MCQs - Complete
Water Pollution Quiz App Free Download & e-Book - 649
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MCQ: 649
The secondary treatment reduces the BOD, ranges from
- 20-50%
- 40-70%
- 70-80%
- 70-95%
d
More MCQs from Environmental Science Textbook
Biosphere Test 660
Biosphere Test 661
Acid Deposition Test 662
Water Pollution Test 663
Trophic Levels Test 664
Solid Waste Management Test 665
Ozone Depletion Test 666
Ozone Depletion Test 667
Water Pollution Test 668
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