1. Công mà khối khí sinh ra là 1000 J, nếu nội năng của khí tăng một lượng 500 J thì nhiệt lượng nhận vào là? A. –1500 J. B. –500 J. C. 1500 J. D. 500 J. 2. Trường hợp nào dưới đây làm biến đổi nội năng KHÔNG do thực hiện công? A. Mài dao. B. Khuấy nước. C. Đóng đinh. D. Nung sắt trong lò.

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