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问题 多项选择题

何技师在完成活动义齿整铸支架蜡型制作、包埋、焙烧后，欲进行铸造。

以下哪些因素可能导致铸件出现冷热裂纹

A．铸型冷却方式不合理

B．熔金温度过高

C．铸造压力过大

D．铸型强度过大

E．铸件厚薄不一

F．熔金温度过低

答案

参考答案：A,E

完形填空
完型填空.
                                                     Where's salt from?
     In the northwest of our country there are __1__ salt lakes. Some __2__ them are very big. The
salt in a big lake can meet the needs of our people for __3__ to come.
     But __4__ of the salt in our country is from the sea.
     Great holes are dug and __5__ the sea water. When the sun dries up the water, salt can be got
__6__ the ground.
     The salt is white and clean __7__ beautiful.
     We can't live __8__ salt. we need it in our food. __9__ need it, too, salt is very important
__10__ us.
( )1. A. a little  
( )2. A. from      
( )3. A. day's    
( )4. A. many      
( )5. A. fill with
( )6. A. of        
( )7. A. and      
( )8. A. if no    
( )9. A. Animal    
( )10. A. of       		B. a bit        
B. of          
B. year's      
B. most        
B. filled with  
B. out          
B. or          
B. with        
B. animals      
B. for          		C. a lot        
C. other        
C. centuries    
C. few          
C. filling into  
C. from          
C. but          
C. have no      
C. children      
C. at            		D. lots of    
D. others      
D. month      
D. little      
D. flits of    
D. down        
D. yet        
D. without    
D. people      
D. to          
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单项选择题

结合农村生产生活和季节用电特点，制定用电（）宣教计划，创新工作方法，做好用电安全知识普及工作。

A.安全培训

B.安全知识

C.安全学习

D.安全教育
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