问题 单项选择题

地面工程预应力锚杆的张拉控制应力不应超过锚杆杆体强度标准值的()倍。

A.0.25

B.0.50

C.0.75

D.1.00

答案

参考答案:C

解析:预应力锚杆与普通锚杆的重要区别在于后者不施加预应力。预应力锚杆在围岩中的作用是可以抵消一部分围岩的荷载作用,因此它要比普通锚杆有大很多的作用效果,预应力越大支护效果就越好;但是,不能为了获得更好的效果,预应力随意取得更高,当杆体的强度一定时,预应力过高就会使锚杆杆体受力过高而威胁支护本身的安全性。预应力一般可以达到杆体自身强度的3/4是比较合理的,既能维持对围岩有较高的作用效果,又能保证锚杆的自身的安全可靠性。

阅读理解

阅读理解

     Have you ever heard of the saying , "if you want a friend, be one."? What does it mean?

     There are many different things that you can do to make friends. You may find out what they

are if you watch someone make friends.

     Here is how one new teacher made friends with the students in her class on the first day of

the school. When the bell rang, the teacher smiled at all the students. Then she said, "Good morning.

How nice it is to have all of you in class this year! I want to know each of you very much. I am

sure we'll enjoy working together."

     The teacher smiled, used a pleasant voice, and acted in a friendly way. She told the students

her name and wrote it on the blackboard. Then she told them something she liked to do and hoped

to do with them during the year. The students knew that she liked many of the same things they

liked. Everyone felt that she meant what she said. Each of them wanted to know her better and be

her friend.

     Then she let the students tell something about themselves. So they felt that the teacher knew

them. Could you make friends as the teacher did?

     How do you know and like your classmates? One way is to find out more about them.

During the break you can talk to them. You may ask them their names and the names of the

schools they went to last year. They want to be friends with people who have the same interests

and play the same games. As you talk, the others may be thinking "I like to do the same things

you do. It should be fun to be friends with you."

    Remember! Just talking together in a friendly way is one good way to make friends.

1.Which do you think is the best title(标题) for this passage?

A. Making Friends

B. How to Talk to Others?

C. A Talk in Class

D. With the Teacher in Class

2.The saying "If you want a friend, be one." means _______.

A. if you want to make friends with others, you should be one of them

B. you can make friends by doing the things that a friend does

C. you can easily make friends with one of the others

D. you can make one good friend if you want to

3.How did the teacher get the students to feel that she would be a good friend?  

A. She laughed at each boy and girl and told them many things she knew.

B. She told the students many things she liked to do. 

C. She laughed and made the students only to know her in a friendly way.

D. She talked and acted in a friendly way to let the students know she really wanted to be

friends with them.

4.If you want to make friends with others, you should _______.

A. tell others as many things you like as possible during the break

B. try your best to show what you can do for them in class

C. talk with them to find out more about them in a friendly way

D. ask them to have dinner with you and play games with you after class

5."Everyone felt that she meant what she said." means that _______.

A. every student in her class felt that she really liked them

B. everyone in her class understood what the teacher said

C. all the students thought it was nothing telling them these things

D. everybody felt tired when they heard what the teacher said.

多项选择题