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				| 1. | For rock type of packing in intermediate filtration trickling filters what is the hydraulic rate considered? | 
| A. | 4-10 m3/m2.d | 
| B. | 10-15 m3/m2.d | 
| C. | 20-25 m3/m2.d | 
| D. | 25-30 m3/m2.d | 
| Answer» B. 10-15 m3/m2.d | |