已知二次函数y=(x+1)2+(x-3)2,当函数y取最小值时,x的值是( )A

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问题:

已知二次函数y=(x+1)2+(x-3)2,当函数y取最小值时,x的值是(  )
A.x=-1B.x=3C.x=2D.x=1
考点:二次函数的最大值和最小值
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工资

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完形填空
     Can you really make out the difference between British Isles, Britain, United Kingdom and England?
These terms are familiar to us, but meanwhile ____1_____to us Chinese.
     The British Isles are made up of two large ____2____: One is Britain and the other Ireland. Britain, or
Great Britain, is the ____3____of the two islands, which is ___ 4_____ into three parts: England, Scotland
and Wale.The United Kingdom (UK) is short for the United Kingdom of Great Britain and Northern
Ireland. UK ____5___ Scotland, Wales and England ( i.e. the whole of Britain), and also about one-sixth
of Ireland, the northern part. The ____6____ of Ireland called the Republic of Ireland is another country.
     England is the largest of the four, and generally speaking, the richest section. Its capital is London,
____7____ is also the capital of the UK. London lies on the River Thames. Much of England is rather flat,
although there are  ____8____ in the northeast and in the center of the country. English people tend to use
the ____9____ "England" and "English" when they mean "Britain" and "British". This sometimes upsets the Welsh and the Scots as they are not included. "Why don't they use 'Walsh' or '____10___' ?" they may
wonder.
     London is beautiful. Today, you cannot deny the beauty, myth, and wonder of the River Thames, which
has good ____11____. However,in the nineteenth century, in some books, the Thames was ____12____
as a grey, dirty, smutty, sooty, smoky river. These were not only existing in nineteenth century. It had
____13____ been like this for centuries,never clear.
     At that time, many ordinary people were ___14       to cholera. This was the ____15____ disease of its day. Neither its cause nor its cure was understood. No one knew the disease just came from the  
___16      water.
So many thousands of ___17___ people died every time there was an(a) ___18       . Disasters like these
always remain us unforgettable lessons.
     Now you know England is of course different from the UK. At present, the UK played an important part in the ____19____affairs. It is a member state of the United Nations, ____20____ the European Union and NATO. "The UN, the UK and the US often go hand in hand in the world,"  people joke. Do you think so?
( )1. A. uninteresting
( )2. A. lands      
( )3. A. larger      
( )4. A. separated  
( )5. A. approves of
( )6. A. part        
( )7. A. it          
( )8. A. hills      
( )9. A. nouns      
( )10. A. Scottish  
( )11. A. appearance
( )12. A. observed  
( )13. A. sometimes  
( )14. A. brought    
( )15. A. enormous  
( )16. A. waste      
( )17. A. worried    
( )18. A. outbreak  
( )19. A. western    
( )20. A. except for
B. surprising  
B. islands    
B. largest    
B. divided    
B. disposes of
B. half        
B. that        
B. lakes      
B. words      
B. England    
B. tastes      
B. found      
B. often      
B. shown       
B. powerful    
B. clean      
B. wounded    
B. war        
B. European    
B. as well as  
C. puzzling    
C. continents  
C. smaller    
C. changed    
C. consists of
C. rest        
C. which      
C. rivers      
C. language    
C. Britain    
C. environment
C. thought    
C. almost      
C. led         
C. terrifying  
C. polluted    
C. cured      
C. fighting    
C. international
C. linking to  
D. amazing      
D. provinces    
D. smallest    
D. sent        
D. complains of
D. others      
D. who          
D. plains      
D. vocabulary  
D. English      
D. surroundings
D. described    
D. always      
D. exposed      
D. deadly      
D. pumped      
D. affected    
D. flood        
D. nationwide  
D. relating to  
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下列程序的输出结果是______。
int x=3;
int y=10;
System.out.println(y%x);

A) 0
B) 1
C) 2
D) 1.0

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什么是柴油机的有效指标?

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确定主导产业时需要考虑的因素包括()

A.经济区位

B.国内市场需求

C.资源状况

D.出口前景

E.国际分工

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