MCQOPTIONS
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| 1. |
The usual values of detention period for flocculation tank ranges from____. |
| A. | 20 to 60 minutes |
| B. | 1 to 2 minutes |
| C. | 2 to 3 hours |
| D. | 2 to 8 hours |
| Answer» B. 1 to 2 minutes | |