问题 问答题 简答题

说明路面结构层中各层次的主要作用?

答案

参考答案:

路面结构层中各层次的主要作用为:

面层:直接承受车辆荷载的作用及自然因素的影响,并将荷载传递到基层的路面结构层

基层:设在基层以下的结构屋。主要承受由面层的车轮荷载,并将荷载分布到地层或土基上,基层可分上基层和底基层。

垫层:设有基层以下的结构屋。主要作用是隔水、排水、防冻、防污,以改善基层和土基工作条件。

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     178 IN Winchester St. ,Chicago

     Basic Photography This is an eight-hour course for beginners who want to learn how to use a 35mm

camera. The teacher will cover such  areas  as  kinds of film ,light and lenses  (镜头) . Bring your own

35mm  camera  to  class.  Course  charge :  $50. Jan.  10, 12, 17 , 19, Tues. & Thurs. 6 :00 - 8 :00

p. m. Marianne Adams is a professional photographer whose photographs appear in many magazines.

    Understanding Computers This twelve-hour course is for people who do not know much about

computers, but need to leam about them. You will learn what computers are, what they can and can't

do, and how to use them. Course charge: $75. Equipment charge :  $10. Jan. 14 ,21 ,28 , Sats.

7 : 00 - 9 : 00  pm. Joseph  Saimders is a professor of Computer Science at New Urban University.

He has over twelve years of experience in the computer field.

    Stop Smoking Do you want to stop smoking? Have you already tried to stop and failed? Now it's the

time to stop smoking using the latest methods. You can stop smoking, and this twelve-hour course will

help you  do  it. Course  charge :  $30. Jan. 4, 11, 18 , 25 , Weds. 4 : 00  - 7 : 00  pm  Dr John  Goode  

is  a practicing psychologist  (心理学家) who has helped hundreds of people stop smoking.

     Typing This course on weekdays is for those who want to learn to type,as well as those who want to

improve their typing. You are tested in the first class and practice at one of eight different skill levels. This

allows you to learn at your own speed. Each program lasts 20 hours. Bring your own paper. Course

charge :  $125. Materials charge: $25. Two hours each evening for two weeks. New classes begin every

two weeks. This course is taught by a number of business education teachers who have successfully taught typing courses before.

1. All the courses listed above are offered to people_________.

A. who live in the city of Chicago

B. who are free in the evening

C. who want to take some special courses

D. who like to learn something new

2. Of all the courses mentioned in the passage, the shortest one is_________. 

A. Understanding Computers        

B. Basic Photography

C. Stop Smoking                  

D. Typing

3.  There are typing courses__________.   

A. on Saturdays and Sundays

B. from Monday to Friday

C. from Monday to Saturday

D. on each day in the week

4. From the passage we can infer that___________.    

A. Marianne Adams has had many photographs printed in a magazine

B. Joseph Saimders has worked in New Urban University for 12 years

C. Dr John Goode's methods of stopping smoking are very successful

D. there are eight different skill levels for business education teachers

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