单选题若某通信链路的数据传输速率为2400bps，采用4相位调制，则该链路的波特率是______。

单选题某工程计划如图2-2所示，各个作业所需的天数如表2-1所示，设该工程从第0天开工，则作业Ⅰ最迟应在第{{U}}{{/U}}天开工。表2-1各个作业所需天数表作业ABCDEFGHIJ所需天数87911845428A．11B．13C．14D．16

单选题In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. The purpose of the testing phase of software development is not to{{U}} (21) {{/U}}the absence of errors in the programs being tested, but rather to find as many errors as possible. This statement may seem to contradict one's intuitive notion of a successful test of a piece of{{U}} (22) {{/U}}; however, a successful test is one in which errors have been found, net one in which no errors have been detected. There are generally two kinds of testing method: human testing and machine testing. In most companies where systems are developed, the first testing that occurs is not machine testing, but rather the detection of errors through{{U}} (23) {{/U}}, team efforts, referred to as walkthroughs and inspection. With these methods, the author of the program forms a group with others who represent programming expertise or who may be part of the project team. After code has been subjected to the manual testing described above, it is then machine test- ed. Again, the test cases are designed to detect the{{U}} (24) {{/U}}number of errors. Incremental or integration testing occurs subsequent to unit testing. This means combing modules with those that have already been unit tested. The incremental approach not only tests the{{U}} (25) {{/U}}of each module, but also the "rippling effects" of errors, and the interfaces among modules.

单选题在下列选项中，属于IIS 6.0提供的服务组件是_______。

单选题把子网掩码为255.255.0.0的网络36.28.0.0分为两个子网，若第一个子网地址为36.28.64.0/18，则第二个子网地址为 (50) 。

单选题T1载波把24条信道按 (16) 方式复用在一条1.544Mbps的高速信道上，每条话音信道的有效数据传输速率是 (17) 。

单选题在计算机的浮点数表示中，主要影响数值表示范围的是______。 A．尾数的位数 B．阶码的位数 C．规格化的方法 D．尾数下溢的处理

单选题以太网的CSMA/CD协议采用坚持型监听算法。与其他监听算法相比，这种算法的主要特点是 （ ） 。

单选题关于曼彻斯特编码，下面叙述中错误的是 （ ） 。

单选题FTP协议是Internet常用的应用层协议，它通过 (56) 协议提供服务，它是基于Client/Server结构通信的，作为服务器一方的进程，通过监听 (57) 端口得知有服务请求。在一次会话中，存在 (58) 个TCP连接。另一个简单的文件传输协议是 (59) ，它的特点是使用UDP协议，且 (60) 。

单选题默认情况下，Windows Server 2003系统强制执行密码复杂性功能。以下字符串不符合作为Windows Server 2003系统默认密码复杂性要求的是______。

单选题在OSPF路由协议配置语句“network 192.168.10.10 0.0.0.63 area 0”中，最后的数字“0”表示______。

单选题如果路由器显示“Serial 1 is down，line protocol is down”故障信息，则问题出在OSI参考模型的（ ） 。

单选题 原型化(Prototyping)方法是一类动态定义需求的方法，{{U}} {{U}} 7 {{/U}} {{/U}}不是原型化方法所具有的特征。与结构化方法相比，原型化方法更需要{{U}} {{U}} 8 {{/U}} {{/U}}。衡量原型开发人员能力的重要标准是{{U}} {{U}} 9 {{/U}} {{/U}}。

单选题LISP是早发展起来主要用于人工智能的{{U}} {{/U}}程序设计语言。 A．命令式 B．面向对象 C．函数式 D．逻辑型

单选题Packet-switching wireless networks are preferable (66) when transmissions are (67) because of the way charges are (68) per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are (69) for the (70) of time they use the network.