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1. |
What is 5 days 20°C BOD equal to ? |
A. | 3 days 27°C BOD |
B. | 4 days 30°C BOD |
C. | 6 days 32°C BOD |
D. | 7 days 35°C BOD |
Answer» C. 6 days 32¬∞C BOD | |