问题 问答题 简答题

制作义齿(假牙)的材料应该满足什么要求?

答案

参考答案:

义齿材料的生产企业必须符合国家的法律、法规,有生产许可证和经营许可证,义齿材料销售单位必须有正规的营业执照和经营许可,生产和销售的产品必须有食品药品监督管理部门颁发的产品注册证。

理想的义齿材料应无刺激性,对口腔黏膜无毒性,无致癌性,对假牙覆盖的组织不导致过敏反应,不溶于唾液,不因口腔环境而腐蚀、变性、耐生物老化,在口腔温度改变中性能稳定,在制作过程中对操作人员无害。此外,还应力求美观、耐用,重量轻,易轻加工,操作简便、取材容易、价格低廉等。

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     I live in a big city with a lot of homeless people. Luckily there're small ways of helping them and you
needn't have a lot of__1__. One way to help is to buy their monthly magazine.__2__doing this one day,
I got to__3__a young homeless man. He was often__4__the magazine at the train station.
     He was a poor farmer from another country. After a while, I discovered that his__5 _was close to
mine. It__6__that we were born in the same month.
    I met him last year__7__after his birthday, and after congratulating(祝贺) him, without__8__,  I asked
if he had had a good day. He__9__and said that he hadn't really celebrated. I felt so __10__.
     I just couldn't bear the thought of (不敢想)this nice, young man being__11__on his 25th birthday
with no presents, no cake, nothing! So I went home and looked in my yarn(纱线) basket.__12__for me,
I had enough yarn__13__. I set to work and knitted(编织) a__14__for the young man. The yarn had
become a little dirty__15__I didn't knit very often. Then I washed the yarn so the scarf would be__16__
when he got it.
     I met him on my own birthday as I was going shopping. I had__17__to meet him so I had__18__the
scarf and a piece of my own birthday  19    around with me. He was very happy with these gifts and so
was I. The__20__in his eyes was the best present he could have given me!
( )1. A. work      
( )2. A. In        
( )3. A. realize    
( )4. A. selling    
( )5. A. birthday  
( )6. A. said      
( )7. A. long      
( )8. A. stopping  
( )9. A. looked up  
( )10. A. foolish  
( )11. A. calm      
( )12. A. Suddenly  
( )13. A. used      
( )14. A. scarf    
( )15. A. when      
( )16. A. different
( )17. A. liked    
( )18. A. made      
( )19. A. cake      
( )20. A. light    
B. energy    
B. On        
B. ignore    
B. reading    
B. house      
B. found      
B. shortly    
B. helping    
B. turned up  
B. excited    
B. happy      
B. Luckily    
B. done      
B. cap        
B. because    
B. dry        
B.  hoped    
B. thrown    
B. present    
B. pain      
C. money        
C. Besides      
C. know        
C. covering    
C. height      
C. guessed      
C. ever        
C. praising    
C. looked down  
C. clever      
C. alone        
C. Badly        
C. left        
C. sock        
C. so          
C. wet          
C. promised    
C. received    
C. song        
C. sight        
D. experience  
D. By          
D. recognize    
D. buying      
D. hobby        
D. meant        
D. even        
D. thinking    
D. got down    
D. worried      
D. hungry      
D. However      
D. produced    
D. glove        
D. and          
D. clean        
D. agreed      
D. carried      
D. party        
D. tear