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【单选题】
在通常操作条件下的同类换热器中，设空气的对流传热系数为α 1 、水的对流传热系数为α 2 ，蒸汽冷凝的传热系数为α 3 ，则（）A.
α 1 >α 2 >α 3
B.
α 2 >α 3 >α 1
C.
α 3 >α 2 >α 1
D.
α 2 >α 1 >α 3
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