MCQOPTIONS
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| 1. |
What is a detention time for mechanically cleaned tanks?$ |
| A. | 2 to 3 hours |
| B. | 2.5 to 4 hours |
| C. | 1.5 to 3 hours |
| D. | 4 to 6 hours |
| Answer» D. 4 to 6 hours | |