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问题 单项选择题

进行蛋白质分析最合适的质谱仪是 ()

A.MALDI-MS

B.MS

C.LC-MS

D.GC-MS

E.GC-MS-MS

答案

参考答案：A

完形填空
完形填空。
     Books are our greatest friends. They  1  us stories of every country in the world. They give us all kinds
of   2 .
     Life is short. One can not know and see  3  in the world.   4 - the help of books, one is able to know what
happened thousands of years ago and  5  is happening in every part of the world now. Books give us not only
knowledge  6  pleasure. Reading good books is the best way of  7  our free time. And many beautiful stories for
children are  8  and full of wisdom (智慧).
     All the great men  9  books. Knowledge from books helps them to succeed, because books are the source
(源泉) of knowledge and knowledge is the source of  10 .
( )1. A. say       
( )2. A. knowledge 
( )3. A. nothing   
( )4. A. With      
( )5. A. how       
( )6. A. and       
( )7. A. spending  
( )8. A. interest  
( )9. A. love      
( )10. A. friendship
                       		B. talk      
B. food      
B. everything
B. Under     
B. when      
B. but also  
B. taking    
B. interested
B. hate      
B. success   
C. Tell       
C. exercise   
C. something  
C. At         
C. what       
C. as well as 
C. costing    
C. interesting
C. dislike    
C. Failure                                                 
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选择题

我国地势三级阶梯划分的主要依据是（　　）

A．地形类型

B．山脉走向

C．平均海拔高度

D．相对高度
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