问题 问答题 简答题

怎样预置燃油系统压力?

答案

参考答案:

在拆开燃油系统进行维修之后,为避免首次起动发动机时,因系统内无压力而导致起动时间过长,应预置燃油系统残余压力。燃油系统压力预置可通过反复打开和关闭点火开关数次来完成,也可按下述方法进行:

(1)检查燃油系统所有元件和油管接头是否安装良好。

(2)用专用导线将诊断座上的燃油泵测试端子跨接到12V电源上,如:日本丰田车系直接将诊断座上的电源端子“+B”与燃油泵测试端子“FP”跨接。

(3)将点火开关转至“ON”位置,使电动燃油泵工作约10s。

(4)关闭点火开关,拆下诊断座上的专用导线。

完形填空
完形填空。
     Everyone needs friends. We all like to __1__close to someone . __2__is nice to  have  a  friend to
talk , laugh ,and do things with. __3_,sometimes we need to be alone . We don't always want people
_4_. But we would feel lonely if we _5_ had a friend.
     No two people are _6_ . Friends _7_don't get on well .That doesn't mean _8_they no longer like
each other. Most of the time they will make up and become __9__ again . Sometimes  friends  move
away. Then  we  feel  very_10_.We miss them very much, but we can_11_them and write to them . It
could  be  that  we could even see them again. And  we can _12__new friends . It is surprising to find
out _13__we like new people when we get to know them .
      There's more good  news  for  people who have friends . They  live  longer  than  people who don't .
Why ? It could be that they are _14_. Being happy helps you stay well . Or it could be just knowing that
someone cares. If someone cares about you, you take _15_ care of yourself.
( )1. A. look  
( )2. A. It      
( )3. A .Hardly    
( )4. A. alone    
( )5. A. ever  
( )6. A. friendly  
( )7. A .always  
( )8. A .that    
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( )10.A. angry  
( )11.A .call    
( )12.A .look for
( )13.A .how often
( )14.A. happier  
( )15.A .less      
B. watch  
B. He      
B. Nearly  
B .away    
B. never  
B .kind  
B. sometimes
B. whether
B. good  
B. sad  
B. ask  
B. find    
B. how long
B. stronger
B. better  
C. feel      
C. There    
C. Suddenly  
C. all over  
C. just    
C. just the same
C. often      
C. how        
C. pleased      
C. happy      
C. tell       
C. make       
C. how many      
C. kinder      
C .little    
D. see                  
D. Someone              
D. Certainly            
D. around              
D. really              
D. quite different      
D. usually              
D. why                  
D. friends              
D. alone                
D. talk with            
D. know                
D. how much            
D. richer              
D. no                  
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