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1. Tại sao vào mùa lạnh, khi hà hơi vào mặt gương ta thấy mặt gương mờ đi rồi sau một thời gian mặt gương lại sáng trở lại ? 2. Tại sao các ống dẫn hơi lại có những đoạn uốn cong? 3. Tại sao người ta không đóng chai nước ngọt thật đầy ?
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