50.A Carnot cycle is an ideal thermodynamic cycle that consists of two isothermal processes exchanging heat with reservoirs and two adiabatic processes. For the Carnot cycle, which of the following statements is true?
(A) The entropy of the reservoir does not change during the cycle.
(B) Work is performed only during the adiabatic processes.
(C) All of the heat absorbed from the hot reservoir is converted into work.
(D) The entropy of the universe increases during one complete cycle.
(E) The thermal efficiency does not depend on the volume of the Carnot engine.

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統計： A(0), B(1), C(0), D(1), E(1) #3847826