采用全双工通信方式,数据传输的方向为( )。A.可以在两个方向上同时传输 B.只能

题型:单项选择题

问题:

采用全双工通信方式,数据传输的方向为( )。

A.可以在两个方向上同时传输

B.只能在一个方向上传输

C.可以在两个方向上传输,但不能同时进行

D.以上均不对

考点:计算机等级考试网络技术三级网络技术笔试64
题型:单项选择题

下列关于叶绿体中色素作用的叙述正确的是

①少数处于特殊状态的叶绿素a的作用是吸收和传递光能 ②叶绿体中的色素均可以吸收、传递和转换光能 ③少数处于特殊状态的叶绿素a可以吸收和转换光能 ④绝大多数叶绿素a、全部叶绿素b和类胡萝卜素可以吸收和转换光能 ⑤绝大多数叶绿素a、全部叶绿素b和类胡萝卜素可以吸收和传递光能[ ]

A.①③

B.②

C.③④

D.③⑤

题型:单项选择题

She is ____ you could ever meet. [ ]

A. as a gentle girl as

B. as gently a girl as

C. a girl as gentle

D. as gentle a girl as

题型:单项选择题
下列物态变化的过程中,需要放出热量的是(  )

A.汽化

B.熔化

C.凝固

D.升华

题型:单项选择题

阅读理解。

     I am a good mother to three children. I have tried never to let my profession stand in the way of being a

good parent.

     I no longer consider myself the center of the universe. I show up. I listen. I try to laugh. I am a good friend

to my husband. I have tried to make marriage vows (誓约) mean what they say. I am a good friend to my

friends, and they to me. Without them, there would be nothing to say to you today. So here's what I wanted to

tell you today: Get a life. A real life, not a desire of the next promotion (提升), the bigger paycheck, the larger

house. Get a life in which you are not alone. Find people you love, and who love you. And remember that love

is not leisure (空闲), it is work. Pick up the phone. Send ane-mail. Write a letter. And realize that life is the best

thing and that you have no business taking it for granted.

      It is so easy to waste our lives, our days, our hours, our minutes. It is so easy to exist instead of to live. I

learned to live many years ago. Something really,really bad happened to me, something that changed my life in

ways that, if I had my choice,it would never have been changed at all. And what I learned from it is what,

today,seems to be the hardest lesson of all. I learned to love the journey, not the destination. I learned to look at

all the good in the world and try to give some of it back because I believed in it, completely and totally. And I

tried to do that, in part, by telling others what I had learned. By telling them this: Read in the backyard with the

sun on your face. Learn to be happy. And think of life as a deadly illness, because if you do, you will live it with

joy and passion as it ought to believed.

1. How did the author form her view of life?

A. By working and social experience.

B. Learning from her friends.

C. Through an unfortunate experience.

D. Because of her children and husband.

2. The underlined sentence "It is so easy to exist instead of to live" in the fifth paragraph probably has

    the same meaning as____.

A. it is so easy to keep alive but not to live a real life

B. it is very hard to live a real life

C. it is so easy to make a living

D. it is more difficult to exist than to live a happy life

3. What's the author's attitude toward work?

A. Do it well to serve others.

B. To earn enough money to make life better.

C. Try your best to get higher position and pay.

D. Don't let it affect your real life.

4. It can be inferred from the passage that _____.

A. the author is a success in personal life

B. the author didn't try her best to work well

C. the author spent all her time caring for her children

D. the author likes traveling very much

题型:单项选择题

在工业厂房的屋架安装测量中,屋架的垂直度允许偏差为()。

A.薄腹梁为3mm,桁架为屋架高的1/100

B.薄腹梁为5mm,桁架为屋架高的1/150

C.薄腹梁为5mm,桁架为屋架高的1/250

D.薄腹梁为8mm,桁架为屋架高的1/250

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