问题 单项选择题

钢管混凝土构件在纵向压力作用下,关于其受力性能的描述,下列哪项是错误的()。

A.延缓了核心混凝土受压时的纵向开裂 

B.提高了核心混凝土的塑性性能 

C.降低了核心混凝土的承载力,但提高了钢管的承载力 

D.提高了钢管侧壁的稳定性

答案

参考答案:C

解析:

钢管混凝土中的混凝土由于受到钢管的约束,其受力状态为三向受压状态。在此状态下,纵向开裂得到延缓,塑性性能提高,抗压能力也得到大幅度提高。

阅读理解

阅读理解。

     Everyone knows that exercise is important. We all need to exercise. Doctors say it is good for us.  It

 makes you strong and smart.  If' you exercise every day, you can get good grades in the exam and do

  homework well.

     There are many ways to exercise. You can walk, run, swim, skate, or play ball games. But remember:

 exercise enough, but not too much. It's best to exercise thirty minutes each time.

     Many people go to special places to exercise. People call them "health centers". They have a lot of

 equipment there. The equipment will help exercise your arms, legs and other parts of your body.

     Exercise can be fun, Friends can exercise together at a health center or play sports together.

l. Which of the following isn't the result (结果) of exercise ?  

    A. It can make us strong and smart.

    B. It can make us do work well.

    C. It can make us get good grades.

    D. It can make us heavy. 

2. If  you want to be healthy, you can't _____ . 

    A. walk or skate        

    B. run or swim

    C. swim or play soccer  

    D. watch TV all day

3. It's best to exercise _____ each time.   

    A. twenty minutes    

    B. thirty minutes

    C. forty minutes      

    D. fifty minutes

4. The underlined word " equipment" means "_____ " in Chinese.

    A. 器材  

    B. 机器

    C. 武器  

    D. 武装

5. Which of the following is WRONG?

    A. Friends can exercise together.    

    B. We should exercise too much.

    C. We all need to exercise.

    D. Exercise can bring us fun.

问答题 简答题