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问题 单项选择题

某屋面檩条跨度6 m，中间设一道拉条作为侧向支承点，作用于檩条的弯矩设计值Mx= 45.O KN·m，My=0.9 KN·m，檩条采用122a，Wx=309.0 cm3，Wy=40.9 cm3，Q235-BF钢(3号钢)，其整体稳定性应力是( )。

(A) 149.8 N/mm2
(B) 164.9 N/mm2
(C) 189.1 N/mm2
(D) 208.2 N/mm2

答案

参考答案：C

解析： 均布荷载作用在上翼缘，3 m，27号普通工字钢，[*]
[*]

改错题
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：如无错误，在该行右边横线上画
一个勾（√）；如有错误（每行只有一个错误），则按下列情况改正：
此行多一个词：把多余的词用斜线划掉，在该行右边横线上写出该词，并也用斜线划掉。
此行缺一个词：在缺词处加一个漏字符号（∧），在该行右边横线上写出该加的词。
此行错一个词：在错的词下画一横线，在该行右边横线上写出改正后的词。
注意：原行没有错的不要改。
    While traveled to Paris on a bus, I became very sick.        
A well-dressing man on the bus helped me greatly. He         
took me off the bus, found out where the doctor's office,     
and took me to there himself. The next day, he came           
to visit me. I didn't speak French well, so I can't talk with  
him very much. However, even if we couldn't talk, but         
we could communicate. I communicated myself thanks             
to his great kindness, and he communicated his concern         
for my healthy. Through this experience I have learned         
that communication can take place with much actual         
language at all.                                                		1._________     
2._________      
3._________      
4._________     
5._________     
6._________                                         
7._________    
8._________    
9._________    
10._________    
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选择题
（单选）如图所示的实验装置中，把浸有乙醚的一小块棉花放在厚玻璃筒内底部，当很快向下压活塞时，由于被压缩的气体骤然变热，温度升高达到乙醚的燃点，使浸有乙醚的棉花燃烧起来，此实验的目的是要说明对物体（   ）

A．做功可以增加物体的热量

B．做功一定会升高物体的温度

C．做功可以改变物体的内能

D．做功一定可以使物态发生变化
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