问题 多项选择题

混凝土中掺入纤维材料的主要作用有(  )。

A.微观补强

B.增强抗裂缝能力

C.增强抗冻能力

D.增强抗磨损能力

E.增强抗碳化能力

答案

参考答案:A,D

解析:【解析】纤维混凝土的作用如下:(1)很好地控制混凝土的非结构性裂缝。(2)对混凝土具有微观补强的作用。(3)利用纤维束减少塑性裂缝和混凝土的渗透性。(4)增强混凝土的抗磨损能力。(5)静载试验表明可替代焊接钢丝网。(6)增加混凝土的抗破损能力。(7)增加混凝土的抗冲击能力。

阅读理解

阅读理解.

     The summer vacation is over. It's true that time always flies fast. During the vacation, the weather was

hot and I could not do much work, but I lived happily.

     As the afternoon was hot, I did my work in the morning. I used to get up at 6: 30 and take a walk in

the garden for half an hour. After breakfast, I began reading English and Chinese and did some exercises

in maths. Those took me three hours or more I worked quite hard and made good progress.

     I spent the afternoon outside. I went to swim and it was funny. I would not go home until it was about

five or six o'clock. Sometimes a friend of mine would come to see me and we would spend some hours

listening to music.

     In this way I spent my vacation happily. And I not only studied well but also became a good swimmer.

Now I am in good health and high spirits.

1. What does the text mainly tell us?                                  

   A. How the writer, spent his summer holidays.                      

   B. What the weather was like in that summer.                        

   C. When the writer got up in the morning.                          

   D. Where the writer took a walk.                                    

2. How long did it take the writer to do his homework?                

   A. Half an hour.                                                    

   B. Three hours or more.                                            

   C. Only one hour.                                                  

   D. Two hours and a half.                                            

3. The writer spent most of the afternoon            .                            

   A. listening to music                                              

   B. visiting his friends                                            

   C. walking in the garden                                            

   D. swimming                                                        

4. The writer had very good summer holidays because he            .              

   A. worked very hard and made good progress                          

   B. learned to swim and did his work well                            

   C. liked swimming better than studying                              

   D. got up early and went home late                                  

5. Which of the following is NOT true?                                

   A. The writer made progress in his lessons.                        

   B. The writer took a walk for half an hour before breakfast.        

   C. The writer began studying as soon as he got up.                  

   D. The writer spent more time swimming than listening to music.    

单项选择题 A1型题