试题与答案

简述种子乳液聚合、核壳乳液聚合、反相乳液聚合。

题型:问答题 简答题

题目:

简述种子乳液聚合、核壳乳液聚合、反相乳液聚合。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:B

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people. I always work at night,    2    there is too much traffic during the day. I go to work at 5:30 in
the afternoon, and I usually    3    between 2:00 and 3:00 in the morning."
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in the car    7   she climbed in through the windows."
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I tied the dog to a tree and started to    9   in through the window. The next thing I knew was that the
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( )1. A. in       
( )2. A. if       
( )3. A. go home 
( )4. A. sad      
( )5. A. The other       
( )6. A. money   
( )7. A. until   
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B. so           
B. go shopping  
B. good                  
B. Another               
B. bag          
B. while         
B. which         
B. walk         
B. can         
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C. though      
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C. strange    
C. The others       
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C. since        
C. who            
C. climb      
C. may        
D. after              
D. because           
D. do housework       
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D. as soon as         
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题型:计算题

(8分)如图a是我们教室用的饮水机,它的铭牌上标有:额定电压220W,加热功率550W,架势到85℃﹣95℃.内部电路图可简化图b,把它接在教室的电路中,正常工作时保温状态的电流是0.2A,求:

(1)保温时饮水机的电功率是多少?

(2)当它处于加热状态时,若消耗的电能全部转化为内能被水吸收,它使热水罐中0.5kg,20℃的水的温度升高到90℃,要消耗多少电能?已知水的比热容是4.2×103J/Kg•℃).

(3)电阻R1的值是多少?

(4)若冬季的加热时间与保温时间之比是1:5,求冬季每小时它消耗多少电能?

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