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【单选题】
用120°C的饱和水蒸气加热常温空气。蒸汽的冷凝膜系数约为2000W/(m 2 ·K),空气的膜系数约为60W/(m 2 ·K),其过程的传热系数K及传热面壁温接近于A.
2000W／(m 2 ·K)，120℃
B.
2000W／(m 2 ·K)，40℃
C.
60W／(m 2 ·K)，120℃
D.
60W／(m 2 ·K)，40℃
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