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【单选题】
某列管换热器,为饱和水蒸气冷凝,冷凝液层流流动。若饱和蒸汽温度与壁差增加一倍时,忽略物性的变化，传热速率将变为原来的多少（）A.
2^(-1/4) 倍
B.
2^(3/4) 倍
C.
2^(1/4) 倍
D.
2^(1/3) 倍
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A.
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B.
envious
C.
enviable
D.
enviously
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A.
副作用
B.
急性中毒
C.
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D.
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E.
后遗效应
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A.
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B.
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C.
in particular
D.
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