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| Q. |
At what depth are the air diffusers placed in the grit chamber? |
| A. | 0.6-0.9 m |
| B. | 1-2 m |
| C. | 0.1-0.4m |
| D. | 0.45-0.6 m |
| Answer» D. 0.45-0.6 m | |
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