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【单选题】
冷热水通过间壁换热器换热，热水进口温度为90℃，出口温度为50℃，冷水走管程，冷水进口温度为15℃，出口温度为53℃，冷热水的流量相同，且假定冷热水的物性相同，则热损失占传热量的（ ）A.
5.26%
B.
5%
C.
6%
D.
7%
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