问题 多项选择题

关于冻结法凿井的特点,说法正确的是()。

A.冻结法要采用人工制冷方法形成冻结壁

B.冻结壁具有一定强度、并隔绝渗水

C.冻结法是用以保护地下结构

D.冻结壁应在地下工程施工前完成

E.冻结壁融化后地下基本不受污染

答案

参考答案:A, B, D, E

解析:冻结法是在不稳定的含水土层或含水岩层中,在地下工程施工之前,用人工制冷的方法,将地下工程周围的含水岩、土层冻结,形成封闭的冻土结构物——冻结壁,用以抵抗岩土压力,隔绝冻结壁内、外地下水的联系,然后在冻结壁的保护下进行地下工程的建设的特殊施工技术。冻结法的一个特点是基本没有污染,它不像注浆方法,浆液注入地下后与岩土体作用,造成对环境的污染或者造成一种不良的环境,冻结法在施工完成、解冻后,岩土体可以基本恢复原来的状态。因此,答案ABDE是正确的,但是冻结法一般不用于保护地下结构,只是一种为保护地下施工的临时结构,因此不能选C项。

阅读理解

阅读理解。

       James is a good student and he has lots of friends, but he also has a problem. Some older boys are bullying

(欺负) him at school. James is very unhappy and he doesn't know what to do about it. Here are some

suggestions to him and other teenagers in this situation. 

       Don't feel worried. It's not your fault (过错)! Being bullied can make you feel very lonely and angry, but

you are not alone. Don't feel that you have to hide the problem. You should find a person you can trust, and tell

them. It might be your teacher, your parents, or even your friend's parents. After you tell someone, you will get

some support and feel some relief (解脱). 

       Speaking to an adult might make you nervous, but here are other things you can do. Some people express

their feelings more easily on paper. Write a letter to someone or keep a diary. Include all the details (细节) about

what the bullies do, as well as when and where the bullying happens. You can use it as proof to show what is

going on. And it is a wonderful idea to show your letter or diary to a teacher or another responsible adult. Then

the bullies will feel very afraid if their names appear in a letter! 

       Also, don't show you are sad and don't try and fight with the bullies. You could get in trouble yourself.

Ignore them and just walk away. The bullies will soon stop.

1. What do you think the text is trying to tell us? [ ]

A. What to do about being bullied.

B. How to be a good student at school.

C. What to write well in a diary.

D. How to give suggestions to teenagers.

2. Why does the text advise you not to feel worried if bullied? [ ]

A. Because you are not alone.

B. Because it is not your fault.

C. Because someone has known about it.

D. Because you' re doing something wrong.

3. You'd better go and find a person you can trust and              . [ ]

A. know what happens

B. learn from them

C. ask for help

D. make them lonely

4. If you remember and follow the suggestions above,              . [ ]

A. nobody will speak to the bullies

B. everybody will feel some relief

C. someone will express their feelings

D. the bullies will soon stop

5. What does the underlined word "ignore" mean in the text? [ ]

A. take no notice of

B. take care of

C. make full use of

D. get more help from

单项选择题