活塞式空气压缩机润滑油()时需补充。A.符合要求 B.不足 C.太脏 D.过多

题型:单项选择题

问题:

活塞式空气压缩机润滑油()时需补充。

A.符合要求

B.不足

C.太脏

D.过多

考点:钻井柴油机工钻井柴油机工(初级)钻井柴油机工(初级)题库
题型:单项选择题
完形填空。
     A folk tale is a very old story that has been passed down from one family to another, from one
generation to another. These old stories are often called fairy (神仙) stories because so many of them
are about   1  . Every country has its own folk tales and its own   2   of telling fairy stories.
     In Germany, there lived two brothers, the Grimm (格林) brothers. They    3   folk tales. We know
these stories   4     "Grimm's Fairy Tales'.
     Many of the tales told about the countries near Germany   5   they lived. Some of them were    6  
     The Grimm brothers did not   7   write the stories for boys and girls. They planned them for older
people living in Germany.   8   when the children heard the stories, they wanted to hear them again and
again.
       9   of this happened long, long ago, but boys and girls everywhere still read and   10   Grimm's tales.
( )1. A. children  
( )2. A. way      
( )3. A. wrote    
( )4. A. in        
( )5. A. where    
( )6. A. wrong    
( )7. A. completely
( )8. A. So        
( )9. A. Much      
( )10. A. enjoy    
B. girls    
B. place    
B. collected
B. like    
B. when    
B. true    
B. easily  
B. But      
B. Part    
B. write    
C. fairies    
C. custom      
C. read        
C. as          
C. as          
C. interesting
C. really      
C. Then        
C. Some        
C. tell        
D. Grimm    
D. tellers  
D. invented
D. for      
D. because  
D. good                                
D. regularly
D. And      
D. All      
D. keep    
题型:单项选择题

常见的金属晶格类形有()_晶格,()晶格()晶格等。铬属于()晶格,铜属于()晶格,锌属于()晶格。

题型:单项选择题

生长发育的一般规律为

A.由上到下

B.由远到近

C.由粗到细

D.低级到高级

E.由简单到复杂

题型:单项选择题

如图所示,小球在竖直放置的光滑圆形管道内做圆周运动,管道内侧壁半径为R,小球半径为r,当小球以初速度V0从管道最低点出发,到最高点时恰好对管道无压力,求:V0的大小

题型:单项选择题

发生光电效应的几率取决于入射伽马光子射出的能量和地层元素的原子序数,对于已知能量的伽马射线,当元素的原子序数增大时,光电吸收系数()。

A、减小

B、增大

C、不变

D、成倍减小

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