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问题 多项选择题

关于填料下列说法正确的是（）

A、四氟填料的摩擦力小，可不带定位器使用

B、石墨填料对于蒸汽、高温水介质使用最佳，应优先选用

C、四氟填料的禁用介质为高温、高浓度强氧化剂

D、中温下，四氟填料可以不带散热器使用，故经济性好

答案

参考答案：A, B, C

完形填空
完形填空。

     A factory began to make a new kind of dog food. A big party was held to    1    the new dog food
to everyone. People    2    the newspapers and TV stations were there.
     There was a dog   3     the party. He would eat the dog food and have his pictures      4   . The plan
was to show everybody    5    the dog would like the new dog food. 
     When the time      6   , a plate of the dog food was given in front of    7    . Everyone looked at the

dog. But there was one    8    . He didn't eat any of it. The dog didn't like the dog food!
     The boss (老板) of the factory had to do    9    quickly. All of the people were watching. All of the
people were    10    . So he ate the dog food himself.

( )1. A. send    
(     )2. A. of    
(     )3. A. by    
(     )4. A. taken   
(     )5. A. how long 
(     )6. A. left  
(     )7. A. everyone
(     )8. A. change
(     )9. A. something
(     )10. A. smiling 		B. take     
B. from      
B. of                    
B. to take   
B. how soon   
B. passed     
B. people  
B. problem    
B. anything  
B. dancing  		C. put    
C. on    
C. at                    
C. taking 
C. how much
C. went   
C. the dog
C. answer 
C. nothing
C. jumping 		D. show       
D. in           
D. in          
D. take       
D. how many    
D. came        
D. the boss 
D. word          
D. everything
D. laughing   
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单项选择题

有关数据仓库的开发特点，不正确的描述是：（）。

A.数据仓库开发要从数据出发

B.数据仓库使用的需求在开发出去就要明确

C.数据仓库的开发是一个不断循环的过程，是启发式的开发

D.在数据仓库环境中，并不存在操作型环境中所固定的和较确切的处理流，数据仓库中数据分析和处理更灵活，且没有固定的模式
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