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【简答题】
两块平行放置的的表面发射率均为 0.8 ,温度分别为 t 1 =527 °C 和 t 2 =27 °C ,板的间距远小于板的宽与高。画出辐射热阻网络图并计算: ( 1 )板 1 的本身辐射; ( 2 )对板 1 的投入辐射; ( 3 )板 1 的反射辐射; ( 4 )板 1 的有效辐射; ( 5 )板 2 的有效辐射; ( 6 )板 1 与 2 的辐射换热量;
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举一反三
【简答题】I
asked him his name, but he didn’t ______________ .
【简答题】请听下面一段对话，回答第1和第2两个小题。 1. What happened to the man? A. He was hurt by the woman accidentally. B. He got injured by himself. C. He has been badly ill for a long time. 2. What can we learn from the conve...
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【简答题】Who’s the boy in the photo? Yes, he is Liu Wei, an armless pianist. Liu lost both arms in an accident at the age of 10, but he never gave up his dream of becoming a pianist. He couldn’t find a teacher...
【单选题】The singer felt very sorry and decided he would never drive again after drinking. The traffic accident was really a ______ to him. [ ]
A.
game
B.
pleasure
C.
skill
D.
lesson
【单选题】The mayor promised to ______ whether the clash was designed, or it just happened by accident.
A.
look after
B.
look about
C.
look into
D.
look ahead
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