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Thermodynamics - Data Intensity 3 :: Discussion
| 20. | The condition for the reversibility of a cycle is | |
| A. | the pressure and temperature of the working substance must not differ, appreciably, from those of the surroundings at any stage in the process | |
| B. | all the processes, taking place in the cycle of operation, must be extremely slow | |
| C. | the working parts of the engine must be friction free | |
| D. | all of the above | |
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