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ychan2o5
2 năm trước
Các bác sĩ nha khoa thường khuyên chúng ta rằng không nên ăn những thức ăn quá nóng hoặc quá lạnh, như thế dễ bị hỏng răng.Bằng kiến thức sự nở vì nhiệt của chất rắn, em hãy cho biết cơ sở của lời khuyên đó là gì ?
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