●集合A={d．b．c}上的二元关系R为：R={<a,a>,<c,c>,<a,b>)}，则二元关系R是__(63)__。

试卷相关题目

• 1●设集合N={0，1，2，…}，f为从N到N的函数，且f(x)=    f(f(+11)    0≤x≤90x-10    x>90经计算f(90)=81，f(89)=81，f(49)=__(62)__。

  A.39

  B.49

  C.81

  D.92

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• 2●Browser/Serer结构是把__(59)__技术和数据库技术结合起来的一种应用模式，这种应用模式把所有应用功能和数据库集中放在__(60)__，实现了开发环境与应用环境的分离，便于管理和系统维护。该模式最大的优点之—是__(61)__。

  A.FTP

  B.TCP/IP

  C.Web

  D.HTTP

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• 3●中央处理器CPU中的控制器是由些基本的硬件部件构成的。__(55)__不是构成控制器的部件。

  A.时序部件和微操作形成部件

  B.程序计数器

  C.外设接口部件

  D.指令寄存器和指令译码器

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• 4●硬磁盘存储器的道存储密度是指__(53)__，而不同磁道上的位密度是__(54)__。

  A.沿同磁道每毫米记录的二进制位数

  B.同一柱面上的磁道数

  C.一个磁道圆周上所记录的二进制位数

  D.沿磁盘半径方向上单位长度(毫米或英时)上的磁道数

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• 5●某计算机有14条指令，其使用频度分别如下表所示；I1    0.15I2    0.15I3    0.14I4    0.13I5    0.12I6    0.11I7    0.04I8    0.04I9    0.03I10    0.03这14条指令的指令操作码用等长码方式编码，其编码的码长至少为__(51)__位。若只用两种码长的扩展操作码编码，其平均码长至少为__(52)__位。

  A.3

  B.4

  C.5

  D.6

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• 6●对n个元素进行快速排序时，最坏情况下的时间复杂度为__(64)__。

  A.O(1og2n)

  B.O(n)

  C.O(nlog2n)

  D.0(n2)

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• 7●任何一个基于“比较”的内部排序的算法，若对6今元素进行排序，则在最坏情况下所需的比较次数至少为__(65)__。

  A.10

  B.1l

  C.21

  D.36

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• 8● 　　SOCKS is a generic proxy protocol for ICP/IP-based networking , applications. SOCKS includes two __(66)__, the SOCKS server and the SOCKS client. The SOCKS server is implemented at the application layer. The SOCKS client is implemented between applications and the __(67)__ layer. When an application client needs to connect to an application server, the client connects to a SOCKS proxy server. The proxy server connects to the application server instead of. the client, and __(68)__ data between the client and the application server. For the application server, the proxy server is the __(69)__ . SOCKS is also one of the popular __(70)__ to network firewalls. Because of its simplicity and flexibility, SOCKS has been used as generic application proxy in virtual private network (VPN), and for extranet applications.

  A.elements

  B.components

  C.services

  D.ctients

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• 9●　　A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with __(71)__, and that it has a mechanism for __(72)__ graphical files. Display text, display graphics, and __(73)__ hyperlinks--there's 99 percent of the __(74)__ value. That's not to say that the manufacturers didn't go all-out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can't wait to delete from your favorites of bookmarks menu、 Remember when client-side Java applets were supposed to become the preferred __(75)__ for application development、 Remember frames and all their nasty side effects、

  A.superlinks

  B.links

  C.hyperlinks

  D.connections

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