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【单选题】
已知:在一逆流式水-水换热器中,为热水,进口温度100°C出口温度为80°C,流过冷水,进口温度20°C,出口温度70°C,总换热量350kW,共有53根内径为16mm、壁1mm的管子。管壁导热系数40W/mK,流体的表面传热系数1500W/m2K,流体为一个流程,表面传热系数3273 W/m2K。管子内、外表面污垢热阻为0.0005m2K/W。求传热系数为()W/m2K。A.
691
B.
480
C.
256
D.
725
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【简答题】Gates
advises young people to ________. (2.0分)A. get the best education they can B. learn how to learn C. take
advantage of high school and college education D. all the above
【简答题】根据兴趣的起因来划分,人的兴趣包括____和____两种,对事物或活动的预期结果感到需要而产生的兴趣是____。
【单选题】Gates advises young people to ______.
A.
get the best education they can
B.
learn how to learn
C.
take advantage of high school and college education
D.
all the above
【单选题】Gates advises young people to ______.
A.
get the best education they can
B.
learn how to learn
C.
take advantage of high school and college education
D.
all of the above
【简答题】Gates advises young people to ________.A. get
the best education they can B. learn how to learn C. take
advantage of high school and college education D. all
the above
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