宽带网络可以分为哪3大部分 A．传输网、混合交换网、接入网 B．传输网、交换网、接入 发布时间：2017-07-10 10:14 │ 来源：www.tikuol.com 题型：单项选择题 问题： 宽带网络可以分为哪3大部分A．传输网、混合交换网、接入网B．传输网、交换网、接入网C．N-ISDN、B-ISDN、ISDND．个人、企业、网络
题型：单项选择题 在临床医学研究中要求对资料保密，以下不属于该范畴的是（）。A.对研究成果严加保密B.对研究资料严加保密C.医师与患者之间的保密D.研究者与双盲对象之间的保密E.研究者与受试者之间的保密 查看答案
题型：单项选择题 完形填空 In the doorway of my home, I looked closely at my 23yearold son, Daniel.In a few hours he would be flying to France to __1__ a different life.It was a transitional (过渡的) time in Daniel's life.I wanted to __2__ him some words of significance.But nothing came from my lips, and this was not the __3__ time I had let such moments pass. When Daniel was five, I took him to the bus stop on his first day of kindergarten.He asked, "What is it going to be like, Dad?Can I do it?" Then he walked __4__ the steps of the bus and disappeared inside.The bus drove away and I said nothing.A decade later, a similar __5__ played itself out. I drove him to college.As I started to leave, I tried to think of something to say to give him __6__ and confidence as he started this new stage of life.Again, words __7__ me. Now, as I stood before him, I thought of those __8__ opportunities.How many times have I let such moments __9__?I don't find a quiet moment to tell him what he has __10__ to me.Or what he might __11__ to face in the years ahead.Maybe I thought it was not necessary to say anything. What does it matter in the course of a lifetime if a father never tells a son what he really thinks of him?__12__ as I stood before Daniel, I knew that it did matter.My father and I loved each other.Yet I always __13__ never hearing him put his __14__ into words.Now I could feel my palms sweat and my throat tighten.Why is it so __15__ to tell a son something from the heart? My mouth turned dry, and I knew I would be able to get out only a few words clearly."Daniel, "I said, "if I could have picked, I would have picked you." That's all I could say.He hugged me.For a moment, the world __16__, and there were just Daniel and me.He was saying something, but tears misted my eyes, and I couldn't understand what he was saying.All I was __17__ of was the stubble (短须) on his chin as his face pressed __18__ mine.What I had said to Daniel was __19__.It was nothing.And yet, it was __20__.( )1. A.experience ( )2. A.show ( )3. A.last ( )4. A.upward ( )5. A.sign ( )6. A.interest ( )7. A.failed ( )8. A.future ( )9. A.last ( )10. A.counted ( )11. A.think ( )12. A.But ( )13. A.wondered ( )14. A.views ( )15. A.important ( )16. A.disappeared ( )17. A.sensitive ( )18. A.by ( )19. A.clumsy ( )20. A.none B. spend B. give B. first B. into B. scene B. instruction B. discouraged B. embarrassing B. pass B. meant B. want B. And B. regretted B. actions B. essential B. changed B. convinced B. against B. gentle B. all C. enjoy C. make C. very C. down C. scenery C. courage C. struck C. obvious C. fly C. valued C. expect C. Instead C. minded C. feelings C. hard C. progressed C. aware C. on C. absurd C. anything D. shape D. instruct D. next D. up D. sight D. direction D. troubled D. lost D. remain D. cared D. wish D. So D. tried D. attitudes D. complex D. advanced D. tired D. with D. moving D. everything 查看答案
题型：单项选择题 放在水平面上的一只木箱100N．木箱与地面间的动摩擦因数为0.1，在水平推力作用下匀速移动20米，则推力对木箱做的功______J，物体克服摩擦力做功______J，地面对木箱的支持力做功______J，摩擦力对木箱做功______J．（取g=10m/s2） 查看答案