问题 名词解释

脆性温度区

答案

参考答案:

在熔池凝固的固液阶段,由于液态金属少(主要是低熔点共晶),在拉伸应力的作用下所产生的微小缝隙都无法填充,只要稍有拉伸应力就有产生裂纹的可能,故把这个阶段叫做脆性温度区.用TB表示。

阅读理解

阅读理解。

     In most schools, all students must wear school uniforms when they are at school. But not every student

likes the school uniform.

     Li Jia, a 13-year-old girl from No.9 Middle School, said, "I don't like my school uniform at all. It is too

ugly. I think young girls should wear some colorful clothes. But, I have to wear it every day."

    However, Su Yang, also a middle school student, has different opinions. He said, "I like my school uniform.

It is very beautiful. It is a symbol (象征) of my school and I like my school very much."

     Mr. Chen, a teacher, told the reporter, "It's good for the students to wear uniforms. It saves a lot of time

and money. In the past, my daughter spent much time on her clothes. But now, she seldom (很少) asks me

to buy clothes for her because she has to wear the school uniform."

     Do you like your school uniform? Welcome to write to us.

1. Most middle school students must wear the school uniform because ________.

A. their parents ask them to do so

B. the uniforms are beautiful

C. they don't have money to buy other clothes

D. it's the school rule

2. What do you know about Li Jia?

A. She doesn't like the uniform because it is expensive.

B. She is an ugly girl.

C. She doesn't like her school uniform at all.

D. She never wears her uniform.

3. What does Su Yang think of his school uniform?

A. He thinks it is very beautiful.

B. He thinks it is very ugly.

C. He doesn't like it.

D. He likes a symbol.

4. The word "opinion" probably means ________ in Chinese.

A. 校服

B. 看法

C. 情况

D. 成绩

5. From the passage, we know that ________.

A. most students like their uniforms

B. most students don't like their uniforms

C. different people have different opinions about their uniforms

D. uniforms are very popular in China

单项选择题 A1型题