Trong các kết luận dưới đây, kết luận nào là chính xác? Khi đun nóng một lượng nước từ 30°C đến 90°C thì: A. Khối lượng không đổi, thể tích tăng. B. Khối lượng của nước tăng. C. Khối lượng tăng, thể tích tăng. D. Khối lượng riêng không thay đổi.

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