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问题 单项选择题

综合安全技术

机器故障的发生是随机的，当应力超过设计规定的额定值时，就发生故障，这时机器处于( )。

A．初期故障期

B．随机故障期

C．磨损故障期

D．偶发故障期

答案

参考答案：D

完形填空
完形填空。

     In the Tang Dynasty (朝代), there was a famous poet    1    name was Li Bai. He was born in a poor
family. And he died     2   1762 AD. When he was young, he didn't like reading.
     Once, he saw an old woman    3    an iron pestle (杵) when he was    4    from the school. Li Bai was
very    5   . He asked    6    that for?
     The old woman said she would grind the iron pestle into a needle (针). Li Bai    7   , "The pestle is so
thick, and when can it be ground down to a needle?" The old woman smiled , "My boy, where there is will,
there is a way!" The pestle is thick, but if I grind it every day, it can be ground down into a needle    8    .
Am I right?"
     Li Bai thought to him self, "what she said is right. Nothing in the world is    9    if I set my mind in it.
It is all the same to the study. If I put my heart into it, can't I study well?"
     Li Bai understand the truth. After that, he studied diligently (勤奋). At last he became a famous poet,
and    10    a good name for more than a thousand years.

( )1. A.who              
( )2. A.in               
( )3. A.grind            
( )4. A.on his way home  
( )5. A.surprise         
( )6. A.what she was doing
( )7. A.stopped          
( )8. A.in the end       
( )9. A.easy to          
( )10. A.left             		B.whose            
B.on                  
B.ground             
B.on his way to home 
B.surprised         
B.why she was doing  
B.wondered           
B.at the end of     
B.hard to me         
B.gave              		C.that              
C.at                   
C.drinding         
C. in his way to home 
C.surprising        
C.what was she doing  
C.liked               
C.by the end          
C.easy for me         
C.showed             		D.which            
D.of               
D.grinds           
D.in his way home  
D.surprises          
D.why was she doing
D.played             
D.to the end       
D.hard for me      
D.put            
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单项选择题

关于骨质软化症的叙述正确的是（）

A.易发生在经绝后高龄妇女

B.骨吸收后被混乱的骨质所替换

C.骨折最容易发生在小梁骨

D.类骨质（非矿化有机基质）增加

E.血清铁含量升高
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