搜题请搜索小程序“爱下问搜题”
问题 选择题

用一批完全相同的多边形地砖铺地面，不能进行镶嵌的是[ ]

A.正三角形

B.正方形

C.正八边形

D.正六边形

答案

答案：C

完形填空
完形填空。
       Paul got  1   the bus to go to the town. It was very crowded and he had to stand for about five   2  .
Then some of the people got  3  . Paul sat down next   4   a fat woman. She   5  several shopping bags and
Paul didn't have much place   6  the seat. He wasn't uncomfortable.   7  last the bus got to the town. All the
people started to get off. Paul was very polite, so he stood  8   to let the fat woman get off before him. She
said, "  9 ." Then she tried to get  10   the seat with all her bags. But she couldn't move. She was too fat and
her bags were too heavy.
(     )1. A. off      
(     )2. A. minutes 
(     )3. A. off      
(     )4. A. in      
(     )5. A. carries 
(     )6. A. in      
(     )7. A. In      
(     )8. A. down     
(     )9. A. Go away 
(     )10. A.  down to
B. on       
B. days     
B. up       
B. at       
B. buys     
B. at       
B. At       
B. under    
B. Go at once
B. off      
C. down    
C. weeks   
C. on      
C. near    
C. had     
C. on      
C. On      
C. up      
C. Look out
C. on      
D. up      
D. years   
D. down    
D. to      
D. has     
D. upon    
D. Up      
D. at      
D. Thank you
D. out of  
查看答案
单项选择题

模具冲头容易磨损之主要原因（）。

A.硬度不够

B.脱料太快

C.进料太快

D.间隙太大
查看答案