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				| 1. | What is the full form of OTR in Diffused Mechanical Aeration Systems? | 
| A. | Oxygen transfer rate in standard conditions | 
| B. | Oxygen transfer rate in clean water | 
| C. | Oxygen transfer efficiency in clean water | 
| D. | Oxygen transfer efficiency in standard conditions in the clean water | 
| Answer» C. Oxygen transfer efficiency in clean water | |