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1. |
If initial Dissolved Oxygen (DO) and final DO after 5 days incubation at 20° C in 1·0% dilution sample are 5·0 mg/L and 4·0 mg/L respectively, what is 5-day BOD of the same sample in mg/L |
A. | 50 |
B. | 100 |
C. | 150 |
D. | 200 |
Answer» C. 150 | |