MCQOPTIONS
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MCQOPTIONS
| 1. |
When does the rate of aerobic oxidation reduced in the sewage that is reduced to the water? |
| A. | When oxygen concentration falls below 1.5 mg/l |
| B. | When oxygen concentration falls below 2.5 mg/l |
| C. | When oxygen concentration falls below 3.5 mg/l |
| D. | When oxygen concentration falls below 4.5 mg/l |
| Answer» B. When oxygen concentration falls below 2.5 mg/l | |