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问题 单项选择题

在稳定传热中，通过多层平壁各材料层的热流强度（）。

A.沿热流方向逐渐增加

B.随时间逐渐减小

C.通过各材料层的热流强度不变

D.沿热流方向逐渐减少

答案

参考答案：C

多项选择题

SLE患者体内增高的Ig类型有（）

A.IgM

B.IgG

C.IgE

D.IgA

E.以上都不对
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改错题
    短文改错  
    此题要求改正所给短文中的错误,对标有题号的每一行作出判断:
    如有错误(每行只有一个错误),则改正.
Dear Mr David Harris,
    I'm very happy to write to you because I accepted the admission notice                               1. _____ 
in Beijing University yesterday. I'll study IT,                                                                            2.        _ 
that I have been dreaming about.                                                                                            3.         _ 
    Mr Harris, I still remember on the first day when you taught us three years ago.                   4.        _ 
We were quite shy and poorly at listening and                                                                         5.        _ 
speaking. You encourage us to practise as much as possible. Your teaching was so                 6.         _
interesting that all of us attracted.                                                                                            7.         _
With your helps I improved my English, and in NMF,T I got                                                   8.           
the satisfactory result. Mr Harris, thank you very much indeed. How are you now                   9.           
in Chicago? Hope to hear you soon.                                                                                       10.        _
                                                                                             Yours．
                                                                                                 Li Wei
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