作屏蔽材料用于屏蔽β射线的物质()。 A.铅 B.铝 C.铁 D.铜 E.锌

题型:单项选择题

问题:

作屏蔽材料用于屏蔽β射线的物质()。

A.铅

B.铝

C.铁

D.铜

E.锌

考点:核医学与技术(医学高级)技术部分技术部分题库
题型:单项选择题

阅读理解。

    Years ago, I lived in a building in a large city. The building next door was only a few feet away from

mine. There was a woman who lived there, whom I had never met, yet I could see her seated by her

window each afternoon, sewing or reading.

    After several months had gone by, I began to notice that her window was dirty. Everything was unclear

through the dirty window. I would say to myself, "I wonder why that woman doesn't wash her window.

It really looks terrible."

    One bright morning I decided to clean my flat, including washing the window on the inside.

    Late in the afternoon when I finished the cleaning. I sat down by the window with a cup of coffee for

a rest.What a surprise! Across the way, the woman sitting by her window was clearly visible. Her

window was clean!

    Then it drawed on me. I had been criticizing (批评) her dirty window,but all the time I was watching

hers through my own dirty window. 

    That was quite an important lesson for me. How often had I looked at and criticized others through the

dirty window of my heart, through my own shortcoming (缺点). 

    Since then, whenever I wanted to judge (评判) someone, I asked myself first, "Am I looking at him

through my own dirty window?" Then I try to clean the window of my own world so that I may see the

world about me more clearly.

1. The writer couldn't see everything clearly through the window because ______. [ ]

A. the woman's window was dirty

B. the writer's window was dirty

C. the wonman lived nearby

D. the writer was near-sighted

2. The writer was surprised that ______. [ ]

A. the woman was sitting by her window

B. the woman's window was clean

C. the woman did cleaning in the afternoon

D. the woman's window was still terrible

3. "It dawned on me" probably means "______". [ ]

A. I began to understand it

B. it cheered me up

C. I knew it grew light

D. it began to get dark

4. It's clear that ______. [ ]

A. the writer had never met the woman before

B. the writer often washed the window

C. they both worked as cleaners

D. they lived in a small town

5. From the passage, we can learn ______. [ ]

A. one shouldn't criticize others very often

B. one should often make his windows clean

C. one must judge himself before he judges others

D. one must look at others through his dirty window

题型:单项选择题

俄罗斯大部分地区都属于[ ]

A.温带大陆性气候

B.温带海洋性气候

C.温带季风气候

D.苔原气候

题型:单项选择题

不计入中央对试点地区增值税和消费税税收返还基数的是()。

A.减征增值税收入

B.改征增值税收入

C.免征增值税收入

D.不征增值税收入

题型:单项选择题

进入石膏旋流器的石膏悬浮切向流动产生离心运动,细小的微粒从旋流器的中心向上流动形成(),溢流进入()。石膏旋流器中重的固体微粒被抛向旋流器壁,并向下流动,形成含固浓度为()的底流。

题型:单项选择题

在NE80E上通过路由策略来修改某条BGP路由的MED值的时候,在route-policy里可通过如下的哪条命令修改对应BGP路由的MED值()

A.apply med

B.apply cost

C.apply cost-type

D.apply local-preference

更多题库