关于X线滤过的说法，错误的是A．滤过是吸收X线束中的低能成分B．_爱下问搜题

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问题单项选择题

关于X线滤过的说法，错误的是

A．滤过是吸收X线束中的低能成分
B．固有滤过是X线管组件本身的滤过
C．X线滤过用铅当量表示
D．总滤过是附加滤过+固有滤过
E．对低能量射线采用铝滤过板

答案

参考答案：C

解析：X线滤过一般用铝当量表示。

完形填空

The three superstars were arriving at the airport and a large crowd of young people had already gathered there to welcome them．The police found it 36  to keep order after the plane landed and the performers 37 ．They smiled and waved cheerfully at everybody．Dressed in the same pink shirts and light blue trousers, with long hair and musical instruments over their shoulders, they all looked   38 ．
Although there were many policemen   39 , the Blare were not able to get to their waiting car _40__ at all. Word spread that they had composed a new song which would be _41  when they performed at the concert that evening．They were now 42 _ with loud cries of " Play your new song! Play your new song!"
When the stars prepared to sing as the   43  for getting away, even the policemen looked   44 , too. The fans settled down and listened to the first 45 _ of the new song．Once it was over, everyone started jumping, clapping and shouting _46 . Several young women even fainted（昏倒） with excitement and were carried away immediately by the   47  standing by. The fans were greedy for more,   48  a repeat performance．Once again, the performers had no choice but to   49 , but when they were asked for still another song, they cheerfully but firmly refused．Closely 50  by the policemen, they walked towards their car some distance  51  . The fans pushed forward, but the policemen, _ 52  arm, prevented anyone getting trough. It took the stars quite a long time to reach their   53  !
Finally, however, they all got in and were just about to leave when a young woman, who had somehow 54  to get past the policemen, jumped onto the roof of the car．She shouted loudly and crazily as two policemen dragged her away and the car started to move very slowly through the   55  crowd．She had just wanted to have a photo taken with the stars !

A．successfully

D．performance

单项选择题

下列颅脑损伤最急需处理的是（）

A.脑震荡

B.颅顶凹陷骨折超过1.5cm

C.颅底骨折引起外耳道出血

D.开放性颅脑损伤，恼组织外溢

E.颅内血肿并脑疝形成