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bestdoctor
2 năm trước
Cho hai vật có nhiệt độ lần lượt t1 và t2 trao đổi nhiệt cho nhau (t1<t2),khi cân bằng nhiệt độ của hai vật là t.Hỏi nhiệt độ t thoả mãn điều kiện nào dưới đây? A.t<t1<t2 B.t1<t2<t C.t1<t<t2 D.t=(t1+t2)/2
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