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问题 单项选择题

为了获得所需性能，大多数热处理都要将钢材加热到（）温度以上。

A.熔化

B.沸腾

C.临界

D.结晶

答案

参考答案：C

完形填空
完型填空。
     It's a photo of Han Han. He is a young writer (年轻作家) in _1_. Many students like _2_ books,
because some of them are about students' life. Han Han is _3_ Shanghai. He's twenty-eight _4_ old.
He can _5_ Chinese and English. Han Han likes running, playing football _6_ computer games. He often
_7_ on his blog (博客). Students can read his articles (文章) on it. Han Han has _8_ yellow dog. It likes
to _9_ with him. Do you know what Han Han's favorite _10_ is? It's the watermelon (西瓜).
( )1.A. America    
(     )2.A. he        
(     )3.A. of        
(     )4.A. days      
(     )5.A. show      
(     )6.A. but        
(     )7.A. watches    
(     )8.A. a          
( )9.A. learn about      
(     )10.A. vegetable 		B. Chinese    
B. his        
B. on          
B. months      
B. find        
B. and        
B. writes      
B. an          
B. look around               
B. fruit       		C. China      
C. him        
C. from      
C. years      
C. speak      
C. or        
C. spells    
C. the        
C. run around                                            
C. dessert    
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单项选择题

电路如图所示，在输入信号ui作用下，输出信号uo在（）时候出现饱和失真。

A．当ui幅值超过12V

B．当ui在零点附近时

C．当ui的幅值超过24V

D．以上都不对
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