问题 问答题 简答题

影响硫磺回收催化剂失活的主要因素有哪些?

答案

参考答案:

1.催化剂的硫酸盐化;

2.催化剂的热老化与水热老化;

3.含碳及含氮物料的沉积;

4.液硫凝结。

完形填空
完形填空。

       We are in No.10 Middle School. We have many   1   in our school.
       We can't arrive late for school. We have to be in the   2   before the lesson begins. We can't eat food
  in class. If someone is   3  , he can eat food between two lessons. But we can't buy food   4   our
  school. We have to buy it in our school shop. And we can't   5   in class. We have to be quiet.
       In English classes, we have to do some   6  . Our English teacher says it is a good way to   7  
  English. Our Chinese teacher is a tall and heavy man. He is very strict with us. We have to   8   straight
  and listen to him carefully in class. Oh, we can't stand these rules,   9   nobody can break (违反) them.
       After class, we can't run in the hallways. It's  10  sometimes. Oh, we can't talk loudly in the dining
  hall as well.

( ) 1. A. lessons        
( ) 2. A. house          
( ) 3. A. late            
( ) 4. A. outside        
( ) 5. A. do our homework
( ) 6. A. shopping        
( ) 7. A. speak          
( ) 8. A. walk            
( ) 9. A. and            
( )10. A. dangerous      
B. students              
B. classroom            
B. hungry                
B. in                    
B. listen to the teacher
B. swimming              
B. improve              
B. write                
B. or                    
B. exciting              
C. rules          
C. library        
C. busy          
C. behind        
C. wear uniforms  
C. cleaning      
C. discuss        
C. sit            
C. but            
C. difficult      
D. questions    
D. hall          
D. tired        
D. next to      
D. talk loudly  
D. reading      
D. talk          
D. run          
D. if            
D. funny        
单项选择题