问题 问答题 简答题

计算题:某生产车间有一台换热器用水来冷却,流量为100kg/h的高温气体,使其从353K冷却到313K,冷却水的进口温度为283K,出口温度为293K,试求单位时间内冷却水吸收多少热量和冷却水的用量?(设高温气体比热容为1.85kJ/(kgK),水为4.18kJ/(kgK),热损失可忽略。)

答案

参考答案:

冷却水吸收热量为2055W。

冷却水用量为176.9kg/h。

选择题
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完形填空。
         In the world today, all of the people need recreation (消遣). We     1    work all the time if we are
going to keep healthy and enjoy life.
         Everyone has his own way of     2    . Perhaps one of the most popular forms     3    to take
part in sports. There are team sports, such as basketball and football. There are    4    individual (各人的)
sports, such as swimming and running. Skating and mountain climbing are the most popular forms of
recreation for people who     5    to be outdoor.
         Not everyone who enjoys     6    likes to take part in them. Many people like    7    them on TV or
listening them on the radio. So many people like some forms of     8     recreation, such as watching TV,
singing and dancing. 
        It doesn't matter    9    we like indoor recreation or take part in outdoor sports. It is important for
everyone to    10   from time to time, and enjoy some forms of recreation.
( )1. A. can       
( )2. A. retiring  
( )3. A. is        
( )4. A. too       
( )5. A. hate      
( )6. A. culture   
( )7. A. looking at
( )8. A. online    
( )9. A. that      
( )10. A. relax    
B. can't      
B. living      
B. are         
B. also        
B. dislike     
B. practice    
B. seeing      
B. worldwide  
B. whether    
B. work       
C. must      
C. sighting   
C. was        
C. even       
C. like      
C. sports     
C. watching   
C. outdoor   
C. when      
C. study        
D. wouldn't   
D. relaxing     
D. were          
D. ever        
D. follow      
D. programs    
D. checking    
D. indoor      
D. although                 
D. dream