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【单选题】
用120°C的饱和水蒸汽加热常温空气。蒸汽的冷凝膜系数约为2000 ),空气的膜系数约为60 ),其过程的传热系数K及传热面壁温接近于( )。A.
2000 ),120℃
B.
2000 ),40℃;
C.
60 K),120℃
D.
60 ),40℃。
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举一反三
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