问题 单项选择题

对一段长度为100米DN500的燃气管道进行氮气置换,当氮气充入量为()m3时,氮气置换完毕。

A、9.8m3

B、19.6m3

C、29.4m3

D、39.2m3

答案

参考答案:C

填空题
阅读理解

阅读理解。

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项.选项中有两项为多余选项。

     I was ten when I first sat with my grandmother behind the cashier(收银台)in her general store.  

1.____ I quickly learned the importance of treating customers politely and saying "thank you. "

     At first I was paid in candy. 2.____    I worked every day after school,and during the summer and

on weekends and holidays from 8 am to 7 pm. My father helped me set up a bank account.    3.____

     By the time I was 12,my grandmother thought I had done such a good job that she promoted me to

selling cosmetics(化妆品) .  I developed the ability to look customers directly in the eye.  Even though

I was just a kid,women would ask me such things as "What color do you think I should wear?" I took

a real interest in their questions and was able to translate what they wanted into makeup (化妆) ideas. 

4.____

     The job taught me a valuable lesson: to be a successful salesperson,you didn't need to be a rocket

scientist-you needed to be a great listener.  5._____    Except they are no longer women purchasing

cosmetics from me;instead,they are kids who tell me which toys they would like to see designed and

developed. 

A. Later I received 50 cents an hour.

B. Before long,she let me sit there by myself.

C. I ended my selling a record amount of cosmetics.

D.  Today I still carry that lesson with me: I listen to customers.

E. My grandma's trust taught me how to handle responsibility.

F.  Soon I found myself looking more beautiful than ever before.

G. Watching my money grow was more rewarding than anything I could have bought.