试题与答案

阅读下面的一段文字。并回答后面的题目: 美国科学家近日研制出一种摄像机,它可以把患

题型:单项选择题

题目:

阅读下面的一段文字。并回答后面的题目:


美国科学家近日研制出一种摄像机,它可以把患者静脉的绿色视频图像投射在皮肤上,这一投影与静脉的实际位置基本一致。这样可大大减少因医护人员静脉注射不熟练给患者带来的疼痛。
这台名为“静脉对比度增强仪”的装置用一架近红外线摄像机实时捕捉患者静脉视频图像,围绕摄像机镜头的一排近红外线发光二极管,以740纳米的波长照亮皮肤,这种波长能被血液吸收,被血管周围组织分散。摄像机拍摄的图像被输入个人电脑并用软件处理,该软件将图像实时映射在一个明亮的绿色背景上,并增强静脉和周围组织之间的对比度,个人电脑然后将图像输入到一架投影机,投影机又将图像投射到皮肤上。
为防止出错,这种装置还特别安装了一种叫“热镜”的装置。“热镜”在可见光下是透明的,可以反射红外线波长。视频投影机和摄像机被设定在相互呈90度角面对镜子的位置上,而镜子相对视频投影机和摄像机呈45度角。经校准后,可以保证一条静脉的投影距离其正确位置的误差始终不超过0.06毫米。

“静脉对比度增强仪”的一级基本构件包括( )。

A.红外线二极管、成像软件、静脉视频图像
B.摄像机、投影机、热镜、电脑
C.红外线二极管、成像软件
D.摄像机、投影机、热镜、红外线

答案:

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题型:阅读理解

阅读理解。

     Nasreddin put two big baskets of grapes on his donkey and went to market. At midday it was very hot,

so he stopped in the shade of a big tree. There were several other men there, and all of them had donkeys

of grapes too. After their lunch they went to sleep. After some time, Nasreddin began to take grapes out of

the other men's baskets and to put them in his basket.

     Suddenly one of the men woke up and saw him. What are you doing? he said angrily.

     Oh, said Nasreddin, don't worry about me. I am half mad, and I do a lot of strange things.

     Oh, really? said the other man. Then why don't you sometimes take grapes out of your baskets and put

them in somebody else's baskets?

     You did not understand me, said Nasreddin.I said that I was half mad, not quite mad.

1.Nasreddin went to market ______. [ ]

A. to sell his donkey

B. to buy something

C. to sell his grapes

D. to find a job

2.Nasreddin stopped ______.

[ ]

A.under a big tree

B.near a big tree

C.around a big tree

D.in a big tree

3.As Nasreddin was taking away the other men's grapes one of the men ______. [ ]

A.pretended not to see him

B.saw him and got angry

C.woke his fellows up

D.came at him

4.Nasreddin said that he did a lot of strange things because ______. [ ]

A.he was clever

B.he was quite mad

C.he was foolish

D.he was half mad

5.In this story Nasreddin was ______. [ ]

A.a selfish man

B.a strange man

C.a friendly man

D.a foolish man

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