 
			 
			MCQOPTIONS
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				| 1. | The range of temperature at which mesophilic microorganism becomes active in sludge digester is ___________ | 
| A. | 30-40oC | 
| B. | 10-40oC | 
| C. | 20-50oC | 
| D. | 20-40oC | 
| Answer» E. | |