MCQOPTIONS
Saved Bookmarks
| 1. |
In a sedimentation tank, the detention period for water ranges from __________ hours. |
| A. | 2 to 4 |
| B. | 8 to 12 |
| C. | 16 to 20 |
| D. | 24 to 32 |
| Answer» B. 8 to 12 | |