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【单选题】
关于传热系数K,下列说法中错误的是( )。
A.
K实际是个平均值；
B.
K随所取的传热面不同而异；
C.
K可用来表示传热过程的强弱，与冷热流体的物性无关；
D.
要提高K值，降低最大的热阻着手。
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