问题 问答题

为防止建筑物在各类荷载作用下变形破坏,要在建筑物上事先分别设置伸缩缝、沉降缝及防震缝,请回答下列问题:
(1) 伸缩缝的主要作用是什么
(2) 在哪些情况下应该留设沉降缝
(3) 伸缩缝和沉降缝在构造上最主要的区别是什么
(4) 工程中有时将防震缝和沉降缝合二为一留设,此时在构造上应按什么要求来留设

答案

参考答案:(1)防止因温度变化造成建筑构件热胀冷缩而在建筑物上产生裂缝和破坏。
(2)建筑物下地基土的承载力差别较大;建筑物相邻两部分高度差别很大。
(3)沉降缝应从基础到屋顶全部分开;伸缩缝只将基础以上的墙体、楼面、屋顶等结构分开。
(4)应按沉降缝的结构设置,其建筑物基础也应分开,且宽度应满足防震缝的要求。

阅读理解

阅读理解。

Dear Sally,

    Thanks for the photo of your family. Here is a photo of my bedroom.

    Look at the photo. A bed, a desk, a chair, a bookcase and a computer are in my bedroom. My bed is 

 near the window. The desk is beside the bed and it's orange. The chair is near the deak. The bookcase is

 behind  the desk and it's black. An English dictionary and a Chinese dictionary are on the bookcase. My

 math, English and Chinese books and my computer are on the desk. My pencil case is in the desk. My

 pens and rulers are in the pencil case. My backpack is on the chair. My brother's white baseball and my

 sister's  computer game are under my bed, but you can't see the baseball in the photo.

                                                                                                                                  Yours

                                                                                                                                 Tommy   

1. It is a photo of _____ bedroom.            

    A. Sally's                              

    B. Tommy's

    C. Tommy's brother's                    

    D. Tommy's sister's

2. The desk is _____ .

    A. behind the bed                      

    B. not in the room

    C. near the window                      

    D. beside the bed             

3. You can't see_____ in the photo.

    A. the math book                      

    B. the baseball

    C. the English dictionary                  

    D. the computer

4. The bookcase in the photo is _____ .

     A. black              

     B. white          

     C. orange        

    D. blue

5. Which is NOT true (正确的)?

    A. Two dictionaries are on the bookcase.  

    B. The pens are in the pencil case.

    C. The backpack is under the chair.      

    D. The baseball is Tommy's brother's

单项选择题