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 | |