问题 问答题 简答题

什么是子午线轮胎?有何优缺点?

答案

参考答案:

子午线轮胎的胎体与胎圈是垂直相交的,帘线的这种分布情况很像地球上的子午线,故称子午线轮胎。

优点:

1.接地面积大,附着性能好。

2.行驶变形小,可降低油耗

3.胎侧薄,散热性能好。

4.带束层强度高,滚动阻力更小,胎面运动降低到最小程度,从而降低了磨损,并延长了轮胎寿命,驻波临界速度高。

缺点:

1.胎侧薄,胎冠厚,在过渡区易产生裂口。

2.侧面变形大,侧向稳定性差。

单项选择题
阅读理解

     There is one type of illness in the world that affects more people than anything else and is very deadly.

If untreated this illness could affect everything you do. What is this illness? Depression. Serious

depression requires professional treatment. Self-induced depression is something each of us can change.

     Everyone's circumstances are different, but the causes of self-induced depression are common: low

self-esteem, hurtful thinking and a bad attitude.

     So how can we change the way we think, feel, and cultivate a cheerful attitude?

     First we must look at ourselves, truly and honestly examining our motives for what we wish to achieve. If you are dissatisfied because you feel you haven't or can't do anything, then one step is needed - to set

goals.

     Always start your goals relatively small and easy to attain. Think of them as sand; one grain may be

insignificant but as a group they form the beach. Once you have set and attained small goals for yourself,

move on to slightly larger, more challenging goals.

     It takes more than just setting goals to be happy. It takes positive thinking. How can we attain this?

     There are a number of factors that can make us think negatively and one of those is diet.

     In my opinion, a person who eats a lot of take out and fast food is feeding their body junk. Start by

eating better foods which give the body much NEEDED minerals. If your physical body is happy, it's

much easier for your mental body or "thinking ability" to be happy.

     Next, exercise. A half-hour a day is recommended for positive well being. Then think about good

memories you had, or generally think of things that make you smile. Remember, everything you wear

costs money but to wear a smile is free. A smile can be the difference between an average day and a

great day.

     If you follow these steps, positive change is inevitable.

1. Which of the statements about depression is TRUE?

A. Depression is a kind of illness that can’t be cured like some cancer.

B. Depression can all be cured successfully by patients themselves.

C. Those who suffer from depression feel dissatisfied with themselves.

D. Those who suffer from depression live in similar circumstances.

2. According to the passage we can learn that ____________.

A. a practical goal can help people to achieve a sense of success

B. we shouldn't be satisfied with small goals that are insignificant

C. we should avoid challenging goals that may lead to failure

D. people can enjoy happiness only if they set reasonable goals

3. In order to achieve positive thinking a person should do these things EXCEPT____________.

A. set challenging goals              

B. eat healthier foods

C. exercise half an hour a day        

D. always wear a smile

4. What can we infer from the reading passage?  

A. Those who can achieve small goals can surely achieve big ones.  

B. Take out and fast food cannot provide people with enough minerals.  

C. You can only exercise half an hour if you want to get rid of depression.  

D. Smile is the cheapest thing compared to other possessions you have.

5. What's the passage mainly about?  

A. To prove the argument that depression can be changed.  

B. To analyze the danger depression can bring to people.  

C. To introduce to readers how to keep positive thinking.  

D. To recommend some ways to deal with depression.