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| Q. |
Which of the following statement is correct? |
| A. | Screens are inclined to increase the opening area. |
| B. | Plain sdimentation is useful as a process preliminary to further treatments. |
| C. | Ratio of the volume of the basin of sedimentation tank to the rate of flow is called detention period |
| D. | all of the above |
| Answer» D. all of the above | |
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