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Choose the correct statement of the following statements (only one statement is correct): O a. The thermal efficiency of a heat engine is smaller

Choose the correct statement of the following statements (only one statement is correct): O a. The thermal efficiency of a heat engine is smaller than its second law efficiency O b. The thermal efficiency of a reversible heat engine equals its second law efficiency O c. The thermal efficiency of a heat engine is greater than its second law efficiency O d. The thermal efficiency of a reversible heat engine is 100%

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