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水泥细度的概念以及我国六大泥标准对水泥细度指标的表示方法？

答案

参考答案：

水泥细度：水泥颗粒的粗细程度叫细度。表示方法，硅酸盐水泥的比表面积大于300m2/kg以上，普通水泥，矿渣水泥，粉煤灰水泥，火山灰水泥，复合水泥用80um方孔，筛余不得超过10.0%.

完形填空
完形填空。

     Last summer I was a volunteer (志愿者) at a shelter(收容所) for the homeless, a place for homeless
people to sleep at night. I wasn't working that summer and was   1   only two classes in summer school,
so I had some   2   time.    
Three nights a week, I   3   in the kitchen of the shelter along with four other volunteers. We planned
and   4   for 45 people hot meals   5   vegetables, chicken, fish and fruit. The homeless people   6   this
good food because many of them usually didn't eat well.
     I   7   this volunteer work, making   8   with the four volunteers in the kitchen. One was a very nice
elderly(上了年纪的) housewife, one a movie actor, another a young teacher, and the other a college
student,   9   me.
     I talked to a lot of the homeless people at the shelter. Their life stories   10  me with sympathy (同情).
Some of them had  11  with alcohol (酒) or drugs while others only had bad   12 . One woman worked
for almost 30 years for a small company, and   13  she lost her job. She looked for a   14  job, but
couldn't
find one, for she was too  15  . She could do nothing but sell her furniture - sofas, chairs, and tables   16 
she could pay for her food. The woman   17  on job hunting, but she   18  couldn't find one. She had no
money for her   19  and had to sleep in her car. Then she had to sell her car. Alone,   20 , and homeless,
she finally came to the shelter.

( )  1. A. studying  
( )  2. A. full      
( )  3. A. helped     
( )  4. A. ordered    
( )  5. A. with       
( )  6. A. demand     
( )  7. A. wanted     
( )  8. A. decisions
( )  9. A. as        
( )10. A. struck    
( )11. A. habits    
( )12. A. luck      
( )13. A. so        
( )14. A. good      
( )15. A. old        
( )16. A. if        
( )17. A. went      
( )18. A. also      
( )19. A. car        
( )20. A. afraid    		B. planning              
B. free                  
B. waited                
B. bought                
B. from                  
B. needed                
B. had                    
B. wishes                
B. like                  
B. filled                
B. worries                
B. pain                  
B. again                  
B. fresh                  
B. poor                  
B. because                
B. moved                  
B. still                  
B. cottage(村舍, 小别墅)
B. shy                    		C. holding        
C. extra          
C. appeared      
C. cooked        
C. by            
C. collected      
C. owned          
C. friends        
C. except        
C. strikes        
C. difficulties  
C. experiment    
C. then          
C. skilled        
C. sick          
C. so that        
C. came          
C. almost        
C. building      
C. happy          		D. taking      
D. long        
D. washed      
D. finished    
D. in          
D. request      
D. enjoyed      
D. changes      
D. besides      
D. provided    
D. problems    
D. loss        
D. thus        
D. new          
D. dull        
D. in case      
D. worked      
D. even        
D. flat(公寓)
D. mad          
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单项选择题

女性，36岁，因烧伤致头顶部瘢痕性秃发3年。查体：头顶部瘢痕面积10cm×8cm，无毛发生长，瘢痕较柔软，与基底颅骨间有一定滑动性。

如果采用头皮扩张法，为取得瘢痕遗留最小，头皮扩张后损失最少的效果，头皮瓣应当()

A．以推进为主，辅以适当旋转

B．以旋转为主，辅以适当推进

C．形成巨大旋转头皮瓣

D．必须彻底切除头皮瓣下的纤维组织包膜

E．旋转后遗留的狗耳必须去除后平整缝合
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