 
			 
			MCQOPTIONS
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				| 1. | When filled which of the following material both nitrogen and BOD are removed? | 
| A. | tRiver rock (Large) | 
| B. | tRiver Rock (Small) | 
| C. | tPlastic High specific area | 
| D. | tPlastic random packing-high specific area | 
| Answer» B. tRiver Rock (Small) | |