1. nhiệt năng là tổng động năng của các phân tử cấu tạo nện vật. vì vậy A.mật độ phân tử càng lớn thì nhiệt năng càng lớn B.nhiệt độ của vật càng thì nhiệt năng của vật càng cao C.áp suất khối khí càng lớn thì nhiệt năng của vật càng lớn D.các phát biểu trên đều đúng

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