MCQOPTIONS
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MCQOPTIONS
| 1. |
In trickling filter, B.O.D. is reduced to___________________? |
| A. | 30 to 40% |
| B. | 40 to 60% |
| C. | 60 to 80% |
| D. | 80 to 90% |
| Answer» D. 80 to 90% | |