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				| 1. | IN_HOW_MANY_CATEGORIES_HEAT_EXCHANGERS_ARE_CLASSIFIED_ON_THE_BASIS_OF_PHYSICAL_STATE_OF_HEAT_EXCHANGING_FLUIDS??$ | 
| A. | 1 | 
| B. | 2 | 
| C. | 3 | 
| D. | 4 | 
| Answer» C. 3 | |