试题与答案

关于螺距的描述,错误的是() A.螺距是扫描旋转架旋转一周,检查床运行的距离与射线束

题型:单项选择题

题目:

关于螺距的描述,错误的是()

A.螺距是扫描旋转架旋转一周,检查床运行的距离与射线束宽度的比值

B.螺旋CT扫描螺距等于零时与非螺旋CT相同

C.增加螺距使探测器接收的射线增加,并使图像质量下降

D.在单层螺旋CT扫描中,床运行方向(Z轴)扫描的覆盖率或图像的纵向分辨力与螺距有关

E.螺距等于0.5时,层厚数据的获取采用两周扫描架的螺旋及扫描

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 god has a horse. The horse was beautiful and also it had many good qualities.   小题1:    It especially wanted to become the most beautiful horse in the world.

One day the horse said to the god, “You have given me beauty. You have given me other good qualities.小题2:   But how I wish you could make me more beautiful! I would be extremely, extremely grateful if you could make me more beautiful.”

The god said, “I’m more than ready to make you more beautiful.  小题3:  ” Then the horse said, “My neck is too short .If you can make neck a little longer, my upper body will be more beautiful. And if you can make my legs much longer and thinner, then I will look more beautiful in my lower body.”

Then immediately the god made a camel appear in place of the horse. The horse was so sad that it started to cry, “Oh, no, I do not want to become a camel.  小题4:As a horse, everybody appreciated my good qualities. Nobody will appreciate me as a camel.”

The god said, “This is exactly  what you asked for. You have become a camel.

小题5:   if you cry for a longer neck and legs, this is what will happen. Each thing in my creation has its own good qualities. The camel is not as beautiful as you are, but it carries heavy loads and has a great sense of duty.”

A.I’m so grateful to you.

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D.Tell me in what way you want to be changed.E.But it wanted to be more perfect in every way.

F.Never try to receive more than I have given you

G.I am glad to know that you feel good with yourself now

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