问题 单项选择题

在城市道路设计时,为了保持平面和纵断面的线形平顺,一般取凸形竖曲线的半径为平曲线半径的()倍。

A.2~5

B.5~10

C.10~15

D.10~20

答案

参考答案:D

解析:城市道路设计时一般希望将平曲线与竖曲线分开设置。如果确实需要重合设置时,通常要求将竖曲线在平曲线内设置,而不应有交叉现象。为了保持平面和纵断面的线形平顺,一般取凸形竖曲线的半径为平曲线半径的10~20倍。应避免将小半径的竖曲线设在长的直线段上。

不定项选择
阅读理解

阅读理解

     Quickly, the picture comes alive with hyperlinks (超链接), offering the names of the buildings, towers

and street features that appear in the photo.The hyperlinks lead to information about the history, services

and context of all the features in the photo.You have just hyperlinked your reality.

     That might be a little unbelievable, but the technology exists and is no fevered imagination.This is not a

cool small machine invented for the next James Bond movie; this is a working technology just developed

by European researchers.It could be coming to a phone near you, and soon.

     This, as the marketing types say, is a game changer.It develops a completely new interface (界面)

that combines webtechnology with the real world.It is big and fresh, but it goes much further and has

much greater influence.

     The development of the system is most outstanding because image recognition technology has long

been pregnant with promise, but seemed to suffer from an unending labour.

     Now MOBVIS has not only developed image recognition; it has also developed more applications for

the technology; and it has adapted it to the world's most popular technology: the mobile phone.

     The MOBVIS system completely rewrites the rules for exploration and interaction with your physical

environment.The system begins with panoramas (一连串景象). These panoramas form the basis of a

city database.It can match buildings, towers, banners and even logos that appear in the panoramas. A

user simply takes a picture of the street feature, MOBVIS compares the user's photograph to the

panoramas and then identifies the buildings from the picture you take and the relevant links are returned.

     Then you simply click on the links, using a touchscreen phone, and the MOBVIS system will provide

information on the history, art, architecture or even the menu, if it is a restaurant, of the building in question.

1. Which is introduced in the passage?

A. A new game software.

B. A popular mobile phone.

C. A cool small machine.

D. An image recognition system.

2. What can we learn about the new technology?

A. It can only be put into use on mobile phones.

B. It is a little unbelievable and just a fevered imagination.

C. It has taken an unending labour to bring the technology into our lives.

D. It will encourage the users to take more pictures of the street features.

3. What is the right order of the operation of MOBVIS?

a. A city database forms in the system.

b. MOBVIS recognizes the picture and links are returned.

c. A user touches the links on the phone screen.

d. A user takes a picture of the street feature.

e. MOBVIS provides information in question.

A. a; e; c; d; b  

B. a; d; b; c; e

C. d; c; e; a; b  

D. c; a; e; b; d

4. From the passage, we can infer that________.

A. MOBVIS has already been widely used all over the world

B. the writer is trying to promote the sales of the MOBVIS system

C. this new technology will soon be very popular in our lives

D. the sales of mobile phones will decrease as MOBVIS comes on market