问题 问答题 简答题

发酵过程泡沫控制有哪两种方法,其优点分别是什么。

答案

参考答案:

①化学消泡法,优点:消泡效果好,作用迅速,用量少,不耗能,也不需要改造现有设备;

②机械消泡法,优点:不需要加入其他物质,从而减少了染菌机会和对下游工艺的影响;

③物理消泡法,用的较少。

阅读理解

阅读理解。

     Do you like sports? If your answer is yes, sometimes you'll find it very difficult to have enough time to

do it, even if it's on weekends. However, you don't have to worry now because a "sunshine sports" program

was launched (启动) by the Ministry of Education (教育部).

     It suggests students around the country have an hour of sports every day. The difference is that students

will be able to do any sport they please. The idea is to make students happy and keep them healthy at the same

time.

     Han Jiawen, from Shanghai Yangsi Middle School, likes the idea. Han and her classmates skip rope together.

"We have a good time." said Han, "Playing is better than having classes."

     Wang Lichao welcomes the idea, too. "It's good to be able to breathe some fresh air instead of sitting in the

classroom."

     But the 14-year-old from Tianjin wonders whether there will be enough space for everyone. "With so many

students outside," he said, "I'm afraid there won't be enough standing room in the playground."

     Wu Jiatong's school is in Liaoning. Wu and other students have been jogging (慢跑) for 40 minutes every

morning. "It's tiring." said Wu, "But we do feel healthier." "We hope we can do what we want. The school says

later we can have rope jumping or kicking( 踢) Jianzi. I can't wait!" she said.

     What about your school? There must be more sports that interest you and your schoolmates.

1. It is very _____ for a student to have enough time to do sports before "sunshine sports".

A. difficult

B. sometimes

C. easy

D. exciting

2. What does "sunshine sports" suggest students to do every day?

A. Have an hour of reading every day.

B. Do any sport they like.

C. Finish their homework on time.

D. Skip rope every day.

3. The idea of "sunshine sports" is to make students _____.

A. weaker

B. healthy

C. noisy

D. both A and B 

4. The underlined word "skip" in the third paragraph means _____.

A. 踩踏

B. 挑选

C. 跳跃

D. 寻找

5. What is the best title of the passage?

A. Sunshine Sports.

B. Doing Sports on the Playground.

C. Skipping Rope Together.

D. My School Sports.

单项选择题