关于3D-PC-MRA的描述错误的是() A.优点为仅血流呈高信号,背景抑制优于3D

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问题:

关于3D-PC-MRA的描述错误的是()

A.优点为仅血流呈高信号,背景抑制优于3D-TOF

B.可用于分析可疑病变区的细节,检查流量与方向

C.大量血肿未吸收时,观察被血肿掩盖的血管病变

D.缺点是在中、低场磁共振成像时间较长

E.成像容积内信号不均匀

考点:放射医学(医学高级)MRIMRI题库
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循环小数5.6767…的小数部分第五十位上的数字是(  )
A.6B.7C.5
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阅读理解。

     A little knowledge can make a difference at a time of life or death. Do you know what to do if

you find yourself in an earthquake?

     If you are inside:

    Quickly move under a strong desk, a strong table or along a wall. You can also go into a small  

room like the bathroom. This will protect you from falling things. Do not get into a lift.

    Don't stand near windows ,large mirrors(镜子) ,heavy furniture or fireplaces.

If you're outside:

     Move away from buildings and streetlights. These could fall on you.

   Squat (蹲下)and protect your head until the shaking stops.

     After the earthquake:

    ●Check, take care of injuries and help make sure people around you are all right.

    ●Watch out for aftershocks.

    ●Protect yourself by wearing long pants, a long-sleeved (长袖的) shirt and strong shoes.

    ●Listen to the radio for the latest information.

l .If you are in a tall building when an earthquake happens, you'd better______.

A. run into a lift

B. not stay in the bathroom

C. stand near large mirrors

D. not stand near windows

2. If you are outside during an earthquake, ______.

A. you must move into a building

B. you cannot squat

C. you have to stop the shaking

D. you must move away from streetlights

3. After the earthquake, you should ______. 

A. look after injuries

B. not help the others around you

C. protect yourself without wearing shoes

D. not listen to the radio for the latest information

4. The underlined word" after shocks" in the passage means's ______ "in Chinese.

A. 震感    

B. 震源  

C. 余震    

D. 防震

5. The passage is mainly about ______.

A. what to do before an earthquake takes place

B. what to do if you are in an earthquake

C. how to escape from an earthquake when you're at home

D. how to predict an earthquake in the open air

题型:单项选择题

人口环境容量与哪些因素有关?

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鉴定价值不是事实发生值。()

题型:单项选择题

转舵油缸中常采用三作用式的是()转舵机构。

A.滚轮式

B.摆缸式

C.滑式

D.转叶式

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