不同的交换方式具有不同的性能。为了使数据在网络中的传输延迟最小,首选的交换方式是(1

题型:问答题

问题:

不同的交换方式具有不同的性能。为了使数据在网络中的传输延迟最小,首选的交换方式是(1);为保证数据无差错地传送,不应选用的交换方式是(2)。分组交换对报文交换的主要改进是(3),这种改进产生的直接结果是(4)。在出错率高的传输系统中,选用 (5)更合适。
(1)

  • A.报文交换
  • B.线路交换
  • C.分组交换
  • D.信元交换
    (2)A.报文交换B.线路交换C.分组交换D.信元交换
    (3)A.路由算法更简单B.差错控制更完善C.传输单位更大且定长D.传输单位更小且定长
    (4)A.提高数据率B.降低误码率C.增加延迟D.减少延迟
    (5)A.虚电路分组交换B.线路交换C.数据报分组交换D.虚电路加数据报分组交换

考点:计算机等级考试网络工程师局域网技术(一)
题型:问答题

关于RhDDEL型,下列哪项说法是错误的()。

A.可通过吸收放散来鉴定

B.作为供血者可以引起抗-D的产生

C.是一种极弱的D变异体

D.间接抗人球蛋白试验阳性

E.间接抗人球蛋白试验阴性

题型:问答题

已知A、B、D、E均为中学化学常见单质或化合物,它们之间的关系如图所示(部分产物略去).

(1)若A、B、D的焰色反应均为黄色,且E为一种酸性的温室气体.

①写出A溶液→B溶液的离子方程式______.

②下面关于化合物A、B、D的说法正确的是______.

A.等物质的量的D与A均匀混合加热最后可得纯净物

B.用稀盐酸和澄清石灰水及相应的仪器即可检验D溶液中是否含B

C.用A溶液即可鉴别CuSO4、FeCl2、Fe2(SO43、Al(NO33、KAlO2溶液

D.往28.6g B•10H2O晶体中缓慢加入10ml 1mo1•L-1H2SO4可得22.4L气体E

(2)若A为一种金属的盐酸盐RCl3,R与盐酸或氢氧化钠溶液反应均产生氢气.

①写出R与氢氧化钠溶液恰好反应得到的溶液中离子浓度的大小顺序______.

②写出A溶液与D溶液反应的离子方程式______.

(3)若A与D相遇会产生白烟,则①实验室制取A的化学方程式为______.②B中的化学键类型为______.③检验A的方法及结论为______.

题型:问答题

After winning a big game, athletes are often asked how they feel. Usually athletes say how (1) it is to win this big game. On the contrary, the fact is that losing a big game, or in my case, all the games, can be even harder.

From the spectators’ point of view, last year’s basketball (2) for my high school team was nothing (3) of an embarrassment. And (4) 0 and 20 is certainly nothing to be proud of, that season had a bigger impact on me than any other. As a team captain, I knew it probably wouldn’t be the (5) year, but did I ever think we would lose every game Of course not. Since six of our top players had graduated, it was clear that we were a (n) (6) team who would struggle. The struggle began earlier than expected, (7) , as our team center was suspended (禁赛) for the season, and two key members decided to (8) for some reason. At this point, dropping out probably passed through every player’s mind, but in the end, we all stuck if out, (9) to work still harder.

Then there came a time when even our (10) and given up on us. Personally, I felt like it was (11) worthwhile giving my all. I thought, if even the coach doesn’t believe in us, why should I But just as my hope began to (12) , a teammate called a meeting. He said," Nobody thinks we are going to win, but, as teammates and friends, we (13) it to each other to go all out every game. "

It was that moment that (14) me how to be a leader. It hit me that I certainly didn’t (15) the role. As a leader you can never quit (16) the team who looks up to you. It is one (17) to be named captain, feel great and go through the motions, but it is quite another to be a real captain and make sure everyone realizes their full (18) all the time.

I am sure it is great to go through without losing and bringing home awards. But in all honesty, I (19) the fact that my team lost every game last year. It may not help me to become a better basketball player, but it already has made me a better leader, and (20)

16().

A.with

B.alongside

C.on

D.for

题型:问答题

全国人大举行会议时,主持会议的是()。

A.全国人大常委会

B.委员会

C.委员长会议

D.选举产生的大会 * * 团

题型:问答题

生物医学工程的重要性是什么?

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