单选题For each blank, choose the best answer from the four choices and write down on the answer sheet. 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?

单选题通常企业在信息化建设时需要投入大量的资金， 成本支出项目多且数额大

单选题在Windows的cmd命令行窗口中输入______命令后得到如下图所示的结果。

单选题通过改变载波信号相位值来表示数字0、1的方法称为______。 A．FSK B．PSK C．ASK D．ATM

单选题如果一个公司有1000台主机，则至少需要给它分配______个C类网络。为了使该公司的网络地址在路由表中只占一行，给它指定的子网掩码必须是______。这种技术叫作______技术。

单选题设有4个IP地址：129.47.16.254、129.47.17.1、129.47.32.254、129.47.33.1，如果子网掩码为255.255.240.0，则属于同一个子网的是______。 A．129.47.16.254和129.47.33.1 B．129.47.17.1和129.47.32.254 C．129.47.17.1和129.47.33.1 D．129.47.32.254和129.47.33.1

单选题●在HTML 语言中，&s 用来表示(43)。

单选题1000BaseSX是一种使用 (30) 作为信号源的网络介质技术，收发器上所配置的激光传输器 (31) ，系统采用 (32) 编码方案。

单选题对100Mbps的传输速率来讲，若采用曼彻斯特编码方式，则要求需要______MHz频率的器件实现。

单选题关于网络安全层次模型的说法，正确的是 (52) 。

单选题______ 不能作为FTP客户端来访问FTP服务器。

单选题下列对IPv6地址FE80:0:0:0801:FE:0:0:04A1的简化表示中，错误的是 ______ 。

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