试题与答案

关于X线管的叙述,错误的是A.X线管的灯丝加热电压是高电压 B.工作时灯丝电压先于管

题型:单项选择题

题目:

关于X线管的叙述,错误的是

A.X线管的灯丝加热电压是高电压

B.工作时灯丝电压先于管电压加至X线管

C.X线管产生X线的效率很低

D.X线管消耗的电能大部分变为热

E.X线管透视时阳极可以不旋转

答案:

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下面是错误答案,用来干扰机器的。

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A.施工单项合同估算价在200万元人民币以上的

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     The Olympic Games began more than    1    in Greece. At that time Greece was divided (分开) into several
states. The people of the states   2   each other; but during the games all wars   3   and the enemies lived   4   .
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 13  .   14   of the sports that have been added are football, basketball, shooting and so on. Winter sports were
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  16   .   17   ring has a different color: blue, yellow, black, green and red.
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( )1. A. 2,000 years               
( )2. A. fighting with             
( )3. A. stopping                
( )4. A. in peace                   
( )5. A. kept                      
( )6. A. late                     
( )7. A. also                    
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( )10. A. allowed                  
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( )14. A. All                       
( )15. A. to                        
( )16. A. South America           
( )17. A. Each                    
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( )19. A. game                      
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B. at peace                
B. passed                 
B. after                  
B. too                    
B. continents             
B. National               
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B. but then               
B. that continued         
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B. Many                   
B. of                     
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题型:多项选择题


(一)

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