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				| 1. | What does OTR stand for? | 
| A. | tOxygen transfer rate in standard conditions | 
| B. | tOxygen transfer rate in clean water | 
| C. | tOxygen transfer efficiency in clean water | 
| D. | tOxygen transfer efficiency in standard conditions in the clean water | 
| Answer» C. tOxygen transfer efficiency in clean water | |