问题 单项选择题

图示两根木杆连接结构,已知木材的许用切应力为[τ],许用挤压应力为[σbs],则a与h的合理比值是()。

A.A

B.B

C.C

D.D

答案

参考答案:A

解析:

图示结构剪切面面积是ab,挤压面面积是hb。

剪切强度条件:………①

挤压强度条件:………②

多项选择题
阅读理解

第二部分阅读理解(满分20分)

阅读下列短文,从每题所给的四个选项(A、B、C和D)中,选出最佳选项,并在答题卡上将该项涂黑。

We are all called upon to make a speech at some point in life, but most of us don’t do a very good job. This article gives some suggestions on how to give an effective speech.

So, you have to give a speech-- and you’re terrified. You get nervous, you forget what you want to say, you stumble over words, you talk too long, and you bore your audience. Later you think, “Thank goodness, it’s over. I’m just no good at public speaking. I hope I never have to do that again. ”

Cheer up! It doesn’t have to be that bad. Here are some simple steps to take the pain out of speech making. Ask yourself the purpose of your speech. What is the occasion? Why are you speaking? Then, gather as many facts as you can on your subject. Spend plenty of time doing your research. Then spend plenty of time organizing your material so that your speech is clear and easy to follow. Use as many examples as possible, and use pictures, charts, and graphs if they will help you make your points more clearly. Never forget your audience. Don’t talk over their heads, and don’t talk down to them. Treat your audience with respect. They will appreciate your thoughtfulness.

Just remember: be prepared. Know your subject, your audience, and the occasion. Be brief. Say what you have to say and then stop. And be yourself. Let your personality come through so that you make person-to -person contact with your audience.

If you follow these simple steps, you’ll see that you don’t have to be afraid of public speaking. In fact, you may find the experience so enjoyable that you volunteer to make more speeches! You’re not convinced yet? Give it a try and see what happens.

1. The main idea of this article is _________.

A. you can improve your speaking ability   B. a poor speaker can never change

C. always make a short speech            D. it is hard to make a speech

2. Paragraph 2 implies that ________.

A. many people are afraid of giving a speech   B. many people are happy to give a speech

C. many people do not prepare for a speech    D. many people talk too long

3. The phrase “talk over their heads” means ________.

A. speak too loudly      B. look at the ceiling

C. look down upon them   D. use words and ideas that are too difficult

4. All of the following statements are true except that ___________.

A. few people know how to make good speeches

B. a lecturer does not need to organize his speech

C. research is important in preparing a speech

D. there are simple steps you can take to improve your speaking ability

5. The title for this passage may be _______.

A. Do Not Make a Long Speech   B. How to Give a Good Speech

C. How to Prepare for a Speech   D. Try to Enjoy a Speech