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传热速率公式Q=KAtm中,tm的物理意义是_______。( )

单选题
2021-09-01 22:49
A、器壁内外壁面的温度差
B、器壁两侧流体对数平均温度差
C、流体进出口的温度差
D、器壁与流体的温度差
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正确答案
B

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