在异步通信中，每个字符包含 1 位起始位、7位数据位和2位终止位，若每秒钟传送500个字符，则有效数据速率为()

试卷相关题目

• 1下面关于Linux目录的描述中，正确的是()

  A.Linux只有一个根目录，用" /root "表示

  B.Linux中有多个根目录，用"/"加相应目录名称表示

  C.Linux中只有一个根目录，用"/"表示

  D.Linux 中有多个根目录，用相应目录名称表示

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• 2在浏览器地址栏输入一个正确的网址后，本地主机将首先在()查询该网址对应的IP地址。

  A.本地DNS缓存

  B.本机hosts文件

  C.本地DNS服务器

  D.根域名服务器

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• 365

  A.S11→S12→S13

  B.S11→S22→S13

  C.S21→S12→S23

  D.S21→S22→S23

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• 464

  A.21

  B.23

  C.20

  D.26

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• 563

  A.O(lgn)

  B.O(n)

  C.O(n2)

  D.O(nlgn)

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• 6以下路由策略中，依据网络信息经常更新路由的是( )

  A.静态路由

  B.洪泛式

  C.随机路由

  D.自适应路由

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• 7The beauty of software is in its function，in its internal structure，and in the way inwhich it is created by a team. To a user，a program withjust the right features presented through an intuitive and( 71 )interface isbeautiful.To a software designer，an internal structurethat is partitioned in a simple and intuitive manner，andthat minimizes internal coupling is beautiful.To developers and managers ，a motivated team of developers making significant progress everyweek，and producing defect-free code，is beautiful.There is beauty on all these levels.our world needssoftware--lots of software. Fifty years ago software was something that ran ina few big and expensive machines. Thirty years ago it was something that ran inmost companies and industrial settings. Now there is software running in ourcell phones，watches，appliances，automobiles，toys，andtools. And need for new and better software never( 72 ).As our civilizationgrows and expands，as developing nations build theirinfrastructures，as developed nations strive to achieveever greater efficiencies，the need for more and moreSoftware( 73 )to increase. It would be a great shame if，in all that software，there was no beauty.Weknow that software can be ugly. We know that it can be hard to use，unreliable ，and carelessly structured. Weknow that there are software systems whose tangled and careless internalstructures make them expensive and difficult to change. We know that there aresoftware systems that present their features through an awkward and cumbersomeinterface. We know that there are software systems that crash and misbehave.These are( 74) systems. Unfortunately，as a profession，software developers tend to create more ugly systems than beautifulones.There is a secret that the best software developers know. Beauty ischeaper than ugliness. Beauty is faster than ugliness. A beautiful softwaresystem can be built and maintained in less time，and forless money ,than an ugly one. Novice software developers don't. understandthis. They think that they have to do everything fast and quick. They thinkthat beauty is( 75 ) .No! By doing things fast and quick，they make messes that make the software stiff，and hard to understand，Beautiful systems eflexible and easy to understand. Building them and maintaining them is a joy.It is ugliness that is impractical.Ugliness will slow you down and make yoursoftware expensive and brittle. Beautiful systems cost the least build andmaintain，and are delivered soonest.

  A.Simple

  B.Hard

  C.Complex

  D.duplicated

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• 872

  A.happens

  B.exists

  C.stops

  D.starts

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• 973

  A.starts

  B.continues

  C.stopsappears

  D.stops

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• 1074

  A.practical

  B.useful

  C.beautiful

  D.ugly

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