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				| 1. | CONSIDER_HE_ABOVE_PROBLEM,_FIND_THE_RATE_OF_CHANGE_OF_TEMPERATURE_AT_THE_INSIDE_SURFACE_OF_THE_TUBE?$ | 
| A. | – 35 degree Celsius/hour | 
| B. | – 45 degree Celsius/hour | 
| C. | – 55 degree Celsius/hour | 
| D. | – 65 degree Celsius/hour | 
| Answer» D. ‚Äö√Ñ√∂‚àö√ë‚àö¬® 65 degree Celsius/hour | |