问题 问答题 简答题

加工误差?什么是疲劳极限?

答案

参考答案:

加工误差就是加工制造出来的零部件都是有误差的,这种误差大体可分为尺寸误差、形状和位置误差、微观几何形状误差(表面粗糙度)三种,这些误差的统称。疲劳极限就是金属材料在无限多次反复交变载荷作用下不致断裂的最大应力。

阅读理解

On June 21, 1982, Prince (王子) William, the future King of England, was born. Since then, he has won all the hearts of the public.

When he was very small, he got a number of nicknames (绰号):King Tot, Willys, Billy, and William the Terrible!He was often found climbing into wastebaskets, trying to flush (冲刷) Dad’s shoes down the toilet (厕所) and pressing buttons, which often made alarm ring!

Prince William has a lot of rules to follow:no drinking in public, no smoking or taking drugs, no kissing girls in public. William was especially close to Diana. However, he has been brave beyond his years since his mother’s sudden death because of the car accident.

Prince William’s fans are growing in number every day. He got more than 12, 000 fan letters a week. When he made a trip to Canada, thousands of girls went frenetic and screamed, “William, will you marry me?” His favorite drink is coke and his favorite foods are burgers, fries, pizza, and chocolate. William also loves to search the World Wide Web. So next time when you’re online, you might be chatting with the future King of England.

Want to write to him? Here it is:

HRH Prince William             

Kensington Palace  Kensington, London W8 4PN  Great Britain

小题1:William’s mother died when he was_____.     .

A. 13                   B. 20                C. 19                  D. 15

小题2:What does the underlined word “frenetic” mean?  

A. Angry.               B.Excited.           C. Stupid.                D. Comfortable.

小题3:Which of the following is NOT TRUE according to the passage?

A. Prince William loves his mother very much.   

B. Prince William likes western food.

C. Prince William has two brothers.    

D. Prince William loves to use the computer.

小题4:Where can you probably see the article?

A. In a magazine       B. In a textbook      C. In a sports report   D. On TV

单项选择题