问题 单项选择题

脉冲序列中,使血液呈高信号的是()

A.进入层面效应,偶回波技术

B.流入性增强,飞越时间效应

C.舒张期血流增强,层面与血管平等

D.层面与血管垂直,偶回波技术

E.舒张期增强,飞越时间效应

答案

参考答案:A

解析:表现为高信号的血流:①流入增强效应。②舒张期假门控现象。③偶回波效应。④梯度回波序列(梯度回波序列血流呈现高信号)。

完形填空
完形填空。
       Traffic rules help to keep order on the road. They also help to keep people   1  . The
  pedestrian (行人) has as many rules to   2   as the driver of a car. You should wall on the
  sidewalk (人行道) or at the side of the road. Always look   3   before you wall across the street. If you
  like riding a bike, don't ride in the middle of the road or run   4   red traffic lights. When you ride a bike
  with a friend, don't look around or tall. Ifyou drive a car, you should   5   at the traffic lights. You must
  always   6   a seat belt (安全带). Without belts   7   the driver and the passengers may be badly hurt in a
  sudden accident.
       You may not need to take a bus, but   8   if you have to travel in one. Get on or get off a bus only when
  it comes to a   9  . When it is full, don't try to get inside   10  you may fall off.
       Traffic rules are also called Road Safety rules.
( )  1. A. healthy  
( )  2. A. follow    
( )  3. A. happy    
( )  4. A. through  
( )  5. A. speed up  
( )  6. A. take      
( )  7. A. half      
( )  8. A. look around
( )  9. A. Sign      
( ) 10. A. and      
B. safe    
B. make    
B. happily
B. across  
B. go ahead
B. wear    
B. none    
B. take care
B. stop    
B. so      
C. happy      
C. break      
C. carefully  
C. along      
C. slow down  
C. carry      
C. both        
C. take a seat
C. comer      
C. or          
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