试题与答案

乙酸正丁酯的合成实验是根据什么原理来提高产品产量的?

题型:问答题 简答题

题目:

乙酸正丁酯的合成实验是根据什么原理来提高产品产量的?

答案:

参考答案:

该反应是可逆的。本实验是根据正丁酯与水形成恒沸蒸馏的方法,在回流反应装置中加一分水器,以不断除去酯化反应生成的水,来打破平衡,使反应向生成酯的方向进行,从而达到提高乙酸正丁酯产率之目的。

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题型:阅读理解

1. The Dream It is everyone’s dream to work at home or not work at all. You can plan your own hours and work when you want to. There is no more rush hour and no hours that people waste when they get to and from a job every day.

2. The Fact The fact is that this dream can be attained. You can stay at home, work when you want to and make money when you need to. There are plenty of chances for you to make money at home, just by using your computer and the Internet.

3. Start Today!  Educate yourself, look closely into all the chances and decide on what works best for you. It will not happen during one night, but you can make the decision today and start to make it happen today.

4. How Could You Do It? Do you have a blog ( 博客) or a personal website like millions of other people? Are you using it to make money? Most of these blogs and website owners are not. But you can do that!

5. _________When you have your computer and the Internet working for you, your businesses will be working for you 24 hours a day, seven days a week. You will make money while you sleep, travel or do whatever you want to do all day long.

6. Get Going! There are many ways you can make money with your computer. And you can begin your stay-at-home businesses with just a little money. What are you waiting for?

小题1:In which part of a newspaper would you most probably read this passage?

A.Sports.

B.News.

C.Culture.

D.Business.小题2:What does the underlined word “attained”in Point 2 mean?

A.Broken.

B.Realized.

C.Lost.

D.Destroyed ( 毁坏 ).小题3:What’s the best title for Point 5?

A.Sleep 24 Hours a Day.

B.Make Money Every moment.

C.Play All Day Long.

D.Travel Around the World .小题4:Which of the following is NOT TRUE according to the passage?

A.People need a lot of money to start a stay-at-home business.

B.People can even use their blogs to make money.

C.People can plan their own time when they work at home.

D.People can make the best decision and start to make it happy today.小题5:How is the passage organized(组织)?

A.By using famous people’s words.

B.By giving reasons only.

C.By showing a topic (话题)and giving reasons for it.

D.By telling old stories.

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