问题 问答题 简答题

浊点和Krafft点有何区别与联系?

答案

参考答案:

浊点和Krafft点皆反映温度与表面活性剂之间的关系。非离子表面活性剂的浊点和离子型表面活性剂的Krafft点相比有所不同。离子型表面活性剂在温度高于Krafft点时,溶解度显著增加,而非离子表面活性剂只有当温度低于浊点时,在水中才有较大的溶解度。如果温度高于浊点,非离子表面活性剂就不能很好的溶解并发挥作用。浊点可表示非离子表面活性剂亲水性的高低。

阅读理解

阅读理解。

      Peter was a small boy. He lived with his parents in a small house near some hills. The people there

were all poor. One night it was very dry and windy. When everybody was asleep, Peter suddenly heard

some noise. It came out from the kitchen (厨房). He got up and walked to the kitchen. He found that the wood beside the stove (火炉)  was burning. There was no water tap (水龙头) in the house,so he could

not put out (扑灭) the fire. He shouted loudly to wake up everyone in the house. Then he ran out of his

house and knocked on the doors of many houses to wake the people up. They all left their houses quickly.At last the fire was put out by the firemen. Many houses were hurt. But nobody was hurt in the fire.

1. Peter lived with his_____.      

A. sisters                  

B. brothers

C. uncles                  

D. parents

2. One night he found that_____beside the stove was burning.      

A. the table              

B. the wood

C. the door                

D. the window

3. _____, so he could not put out the fire.       

A. Everybody was asleep

B. He couldn't shout loudly

C. The kitchen was very big

D. There was no water tap in the house

4. Peter knocked on the doors of many houses _____.        

A. to wake the people up

B. to get some water

C. to find his classmates

D. to visit the people

5. _____hurt in the fire.      

A. People in other houses were

B. Peter's parents were

C. Nobody was

D. Peter was

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