单选题下列关于ADSL的叙述中，正确的是{{U}} {{/U}}。 A．ADSL的上传速度比下载速度快 B．ADSL支持的频带宽度是普通电话用户频带宽度的10倍 C．ADSL只支持语音业务、视频业务、VPN虚拟专网业务 D．ADSL可用于家庭上网、远程办公、远程教育、视频会议等

单选题对于一个相始为空的栈，其入栈序列为 1、2、3、、n (n3) ，若出栈序列的第一个元素是 1，则出栈序列的第n 个元素

单选题对计算机软件的法律保护不涉及_____________。

单选题对于容量为32K×32位、按字编址(字长为32)的存储器，其地址线的位数应为_____________。

单选题在浏览器地址栏中输入________可访问FTP站点ftp．abc．com。

单选题82.{{U}} {{/U}}应用服务将主机变为远程服务器的一个虚拟终端。在命令方式下运行时，通过本地机器传送命令，在远程计算机上运行相应程序，并将相应的运行结果传送到本地机器显示。 A．E-mail B．FTP C．WWW D．Telnet

单选题The ARPANET{{U}} (79) {{/U}}( the rules of syntax that enable computers to communicate on a network) were originally designed for openness and flexibility, not for{{U}} (80) {{/U}}The ARPA researchers needed to share information easily, so everyone needed to be an unrestricted "insider" on the network. Although the approach was appropriate at the time, it is not one that lends itself to today's commercial and government use. As more locations with computers (known as{{U}} (81) {{/U}}in Internet parlance)joined the ARPANET, the usefulness of the network grew. The ARPANET consisted primarily of university and government computers, and the applications supported on this network were simple: electronic mail ( E - mail), electronic news groups, and{{U}} (82) {{/U}}connection to other computers. By 1971, the Internet linked about two dozen research and government sites, and researchers had begun to use it to exchange{{U}} (83) {{/U}}not directly related to the ARPANET itself. The network was becoming an important tool for collaborative research.

单选题功能模型中所有的 (46) 往往形成一个层次结构。在这个层次结构中一个数据流图的过程可以由下一层数据流图做进一步的说明。

单选题在下列程序中，调用f1(x)时，实参a与形参x以引用调用的方式传递信息，其输出结果为(33)，调用f2(y)时，实参b与形参y以传值的方式传递信息，其输出结果为(34)。

单选题堆栈的访问方式是{{U}} (27) {{/U}}，其中堆栈指针在数据入栈时{{U}} (28) {{/U}}。

单选题类之间共享属性和操作的机制称为{{U}} (34) {{/U}}。一个对象通过发送{{U}} (35) {{/U}}来请求另一个对象为其服务。

单选题若存储周期为250ns，每次读出16位，则该存储器的数据传送率为 (19) 。

单选题在OSI参考模型中，同等层相互交换信息的实体构成了 (32) 。

单选题When you are (71) a home or small office network, it is recommended that you use the Network Setup Wizard in Windows XP Home Edition to enable Internet Connection Sharing. The Network Setup Wizard automatically provides all of the network settings you need to (72) one Internet connection with all the computers in your network. After ICS is enabled, and you make sure that all of your computers can (73) with each other and they have Internet (74) you can use programs such as Internet Explorer and Outlook Express as if they were (75) connected to the Internet service provider (ISP). When a request to the Internet is made, the ICS host computer connects to the ISP and creates the connection so that other computers can reach a specified Web address or download e-mail.

单选题DDOS(Distributed Denial of Service)攻击的目的是

单选题 47．CPU中，保存当前正在执行的指令的寄存器是{{U}} (59) {{/U}}。表征指令执行结果的寄存器是{{U}} (60) {{/U}}。

单选题电子邮件中的两个协议中， (66) 协议是接收邮件的协议， (68) 协议是发送邮件的协议。