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| Q. |
The amount of oxygen consumed by the aerobic bacterias which cause the aerobic biological decomposition of sewage, is known |
| A. | Bio-Chemical Oxygen Demand (B.O.D.) |
| B. | Dissolved Oxygen (D.O.) |
| C. | Chemical Oxygen Demand (C.O.D.) |
| D. | None of these |
| Answer» B. Dissolved Oxygen (D.O.) | |
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