2010 Professional Knowledge Morning, Question 56
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56. Which of the following is a fact related to thermodynamics (two characters)? A. It is not possible to create hydrodynamic sails. B. It is not possible to fully reverse a natural process. C. It is not possible to reach absolute zero. D. It is not possible to achieve a state of complete equilibrium. I remember that the answers given in previous discussions were AC, but I think it should be ABC. By the way, what is a hydrodynamic sail?
In my actual exam questions, the answer to this question was A: It is impossible to create a perpetual motion machine; therefore, the correct choices are ABC； If it’s based on what you said, I think it’s AC