光纤传输具有较高的可靠性,ATM网络只采用了简单的差错控制方式。其信元头校验在 (3

题型:单项选择题

问题:

光纤传输具有较高的可靠性,ATM网络只采用了简单的差错控制方式。其信元头校验在 (31) 功能层完成。信元定界在 (32) 功能层完成。

A.PMD子层

B.MAC子层

C.TC子层

D.ATM层

考点:计算机软件水平考试中级网络工程师中级网络工程师上午试题
题型:单项选择题

在如图所示“研究平抛物体的运动”的实验中,采用以下方法:

(1)为使小球作平抛运动,必须调整斜槽末端的切线方向,其目的是________________________________.

(2)检验实验得到的轨迹是否准确的一种方法:从曲线上某点处画三段连续等长的水平直线,再在该水平线等间距处对应作三条竖直线与曲线交于三点,相应得到三段y轴方向的位移y1、y2、y3,如右图所示.若轨迹正确,则三段y轴位移之间应满足的关系是y3=_____________.

题型:单项选择题

阅读理解。

     In the fall of 1985, I was a bright-eyed girl heading off to Howard University, aiming at a legal career and

dreaming of sitting on a Supreme Court bench somewhere. Twenty-one years later I am later I am still a bright-

eyed dreamer and one with quite a different tale to tell.

     My grandma, an amazing woman, graduated from college at the age of 65. She was the first in our family

to reach that goal. But one year after I started college, she developed cancer. I made the choice to withdraw

from college to care for her. It meant that school and my personal dream would have to wait.

     Then I got married with another dream: building my family with a combination of adopt and biological

children. In 1999, we adopted our first son. To lay eyes on him was fantastic and very emotional. A year later

came our second adopted boy. Then followed son No.3. In 2003, I gave birth to another boy.

     You can imagine how fully occupied I became, raising four boys under the age of 81. Our home was a

complete zoo-a joyous zoo. Not surprising, I never did make it back to college full-time. But I never gave up

on the dream either. I had only one choice: to find a way. That meant talking as few as one class each semester. 

     The hardest part was feeling guilty about the time I spent away from the boys. They often wanted me to

stay home with them. There certainly were times I wanted to quit, But I knew I should set an example for

them to follow through the rest of their lives.

     In 2007, I graduated from the University of North Carolina. It took me over 21 years to get my college

degree!

     I am not special, just single-minded. It always struck me that when you're looking at a big challenge from

the outside it looks huge, but when you're in the midst of it, it just seems normal. Everything you want won't

arrive in your life on one day. It's a process. Remember: little steps add up to big dreams.

1. When the author went to Howard University, her dream was to be _____.

A. a writer

B. a teacher

C. a judge

D. a doctor

2. Why did the author quit school in her second year of college?

A. She wanted to study by herself.

B. She fell in love and got married.

C. She suffered from a serious illness.

D. She decided to look after her grandma.

3. What can we learn about the author from Paragraphs 4 and 5?

A. She was buy yet happy with her family life.

B. She ignored her guilty feeling for her sons.

C. She wanted to remain a full-time housewife.

D. She was too confused to make a correct choice.

4. What does the author mostly want to tell us in the last paragraph?

A. Failure is the mother of success.

B. Little by little, one goes far.

C. Every coin has two sides.

D. Well begun, half done.

5. Which of the following can best describe the author?

A. Caring and determined.

B. Honest and responsible.

C. Ambitious and sensitive.

D. Innocent and single-minded.

题型:单项选择题

淋巴细胞的表面抗原的检测可用于T淋巴细胞的亚群分类、功能分析等。CD抗原是淋巴细胞表面的分化抗原。

表达于成熟B细胞表面的CD分子是()

A.CD10

B.CD21

C.CD28

D.CD16

E.CD69

题型:单项选择题

关于头痛的治疗药物

长期精神比较紧张的紧张性头痛者,推荐使用

A.麦角胺咖啡因片
B.地西泮片
C.阿司匹林
D.对乙酰氨基酚
E.卡马西平

题型:单项选择题

根据图示回答下列问题:

图1所示全过程叫(),图2生理过程与图1中相应序号是(),可进行这一生理过程的结构有()。图3生理过程与图1中相对应序号是(),图4生理过程与图1中相对应序号是()。

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