问题 多项选择题

以下有关固定桥的应力分析正确的是()

A.同一载荷下,后牙桥的应变大于前牙桥

B.同一载荷下,上颌前牙桥的应变大于下颌前牙桥

C.桥体的三维结构影响应变

D.应力的大小与载荷作用的大小有关,与部位无关

E.固定桥制作材料的刚度影响应变

答案

参考答案:B, C, E

问答题
完形填空

请先阅读下面短文,掌握其大意,然后根据短文内容从下面方框内的七个选项中,选择五个还原到文中,使短文意思通顺、结构完整,并在答题卷上将其序号涂黑。(每小题2分)

Hi Grace,

How's it going? Sorry I haven't emailed for a while, but I had so much to do!

I had told you about my decision to take up a sport. I knew I wasn't fit and I wanted to get some exercise. But that wasn't the only reason that I decided to do a sport. Students who play sports do better at school. 小题1:                    Exercise also helps learning and memory (记忆).

 小题2:                 First, I tried soccer. I had played a bit of soccer before and I thought it wouldn't be too bad. I knew I couldn't nm for very long without feeling tired. On the first day, I was able to nm for the first ten minutes, but then I was so tired that I couldn't even kick the ball!

Then, I tried volleyball. 小题3:               I was able to run for the first twenty minutes and I wasn't the slowest runner in the team! After a few weeks .I could run faster and longer. I was doing better and feeling better. 小题4:            Maybe I'm not a team sport person after all!

Finally, I tried kung fu (功夫). It's a great sport that exercises the body and the mind. You learn to follow instructions carefully and do what you are asked to do. This is the right sport for me!  小题5:                 I feel so confident that l even showed some moves to the class last week! Can you believe it?

I hope you're OK! Write and let me know what you've been doing!

Bye for now!

Kristie