不随意肌是()。 A.平滑肌和骨骼肌 B.骨骼肌和心肌 C.心肌和平滑肌 D.以上都

题型:单项选择题

问题:

不随意肌是()。

A.平滑肌和骨骼肌

B.骨骼肌和心肌

C.心肌和平滑肌

D.以上都不正确

考点:中学体育与健康(初级)运动人体学运动人体学题库
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世界上种类最多、分布最广的植物类群是( )

A.藻类植物

B.蕨类植物

C.裸子植物

D.被子植物

题型:单项选择题

环境敏感区包括()。

A.水源保护区

B.红树林

C.天然湿地

D.基本农田

题型:单项选择题

挂篮预压加载时应注意()、()进行。

题型:单项选择题
完形填空。
     Once there was an old farmer, with a horse which was almost as old as himself. He   1  one morning
with his young son,    2    the horse before it died. Father and son walked,   3   the farmer did not want the
horse to be  4   ?
   They met two men on the road  5   said: "Why are you walking, farmer? You have a horse. It's  6   to
market." The farmer knew that this was   7  , so he rode on the horse,   8   his son walked. ?
   Then they met two old ladies. "  9   are you doing up there, farmer? Can't you  10   how tired your boy
is?"   11   the farmer got down, and his son rode  12 ?
      13  , three old men stopped them. One said: "Why are you walking, farmer?  14  . It's too hot for an
old man like you to walk today." So the farmer got up  15  his son, and they  16   ?  17  , a young woman
passed them. "Why aren't you walking?" she asked. "It isn't   18   to market. Give your poor old horse a
rest."
     So the farmer, and his son, got down   19  ?
     It is a fact that you cannot please  20   the people all the time. ?
( )1. A. set out          
( )2. A. selling          
( )3. A. so              
( )4. A. very tired      
( )5. A. which            
( )6. A. a short way      
( )7. A. real            
( )8. A. while            
( )9. A. What            
( )10. A. see            
( )11. A. Because        
( )12. A. thus            
( )13. A. First          
( )14. A. Sit down        
( )15. A. behind          
( )16. A. walked on      
( )17. A. Some time later
( )18. A. near            
( )19. A. once again      
( )20. A. both        
B. set up        
B. buying        
B. because      
B. too tired    
B. who          
B. a long way    
B. true          
B. when          
B. How          
B. watch        
B. As            
B. yet          
B. Finally      
B. Sit up        
B. after        
B. rode on      
B. A moment ago  
B. long          
B. on their own  
B. each of      
C. set down      
C. to sell        
C. that          
C. quite tired    
C. as            
C. the right way  
C. truly          
C. as            
C. Why            
C. look          
C. For            
C. instead        
C. Near          
C. Get up        
C. beside        
C. moved on      
C. In no time    
C. far            
C. the other day  
C. all        
D. set?            
D. to buy?          
D. when?            
D. tiring?          
D. where?          
D. the wrong way?  
D. really?          
D. during?          
D. When?            
D. notice?          
D. So?              
D. either?          
D. Next?            
D. Get down?        
D. above?          
D. drove on?        
D. At once?        
D. short?          
D. all the same?    
D. none of        
题型:单项选择题

一般闭式循环淡水冷却的柴油机中缸套穴蚀主要由()引起。

A.空泡腐蚀

B.电化学腐蚀

C.低温腐蚀

D.应力腐蚀

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