问题 问答题 简答题

使用两根等长绳扣单吊钩欲把一细长物件吊成水平状态,如吊点选择不当,会发生什么情况,试论述之。

答案

参考答案:

使用单吊钩吊起物件时过吊钩的垂线一定要通过物件重心,这是在任何情况下均遵循的普通规律。由此可知使用两根等长绳扣欲把一细长物件吊成水平状态,两吊点应关于过重心的垂线对称。如不能满足这一条件,而重心尚在两吊点之间时,物件悬吊后呈倾斜状态,两绳扣均受力,重心向其中一吊点偏得越多,物件倾斜越甚。如重心已不在两吊点之间,那最后由靠近重心的一吊点单点将物件悬吊,呈倾斜状态,该吊点离重心越远,物件悬吊后倾斜越甚。

完形填空

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

To forgive is a virtue(美德), but no one has ever said it is easy. When someone has deeply hurt you, it can be extremely difficult to let go of your hate. However, forgiveness is possible, and it can be surprisingly beneficial to your physical and mental health. People who forgive show less sadness, anger and stress and more hopefulness, according to a recent research.

  小题1:   Try the following steps:

Calm yourself.    小题2:   You can take a couple of breaths and think of something that gives you pleasure: a beautiful scene in nature, or someone you love.

Don't wait for an apology. Many times the persons who hurt you do not intend to apologize. They may have wanted to hurt you or they just don't see things the same way.   小题3:  Keep in mind that forgiveness does not necessarily mean becoming friends again with the person who upset you.

Take the control away from your offender (冒犯者). Rethinking about your hurt gives power to the person who causes you pain. Instead of piling your sad feelings in your heart, learn to look for the love, beauty and kindness around you.

  小题4:   If you understand your offender, you may realize that he or she was acting out of unawareness, fear, and even love. You may want to write a letter to yourself from your offender's point of view.

Don't forget to forgive yourself.    小题5:   But it can rob you of your self-confidence if you don't do it.

A.Why should you forgive?

B.How should you start to forgive?

C.Recognize the benefits of forgiveness.

D.Try to see things from your offender's angle.E. For some people, forgiving themselves is the biggest challenge.

F. To make your anger die away, try a simple stress-management technique.

G. If you wait for people to apologize, you could be waiting an awfully long time.

单项选择题