单选题采用数学模型求解实际问题常会有误差，产生的原因不包括______。

单选题系统中有R类资源m个，现有n个进程互斥使用。若每个进程对R资源的最大需求为w，那么当m、n、w取表7-6的值时，对于表7-6中的a-e五种情况， (77) 可能会发生死锁。 表7-6进程和资源表 a b c d e m n w 2 1 2 2 2 1 2 2 2 4 3 2 4 3 3

单选题在数据处理应用中，有时需要用多项式函数曲线来拟合一批实际数据。以下图中，______体现了三次多项式曲线的特征。A．B．C．D．

单选题设某进程的段表如表2-10所示，逻辑地址 (28) 可以转换为对应的物理地址。 表2-10 某进程的段表 段 号 基地址 段 长 01234 15984869013271952 600501002988960

单选题最适合在共用电话交换网(PSTN)上实时传输视频数据的标准是 (27) ，DVD中视频的编码规范符合 (28) 标准。

单选题3DES在DES的基础上，使用两个56位的密钥K1和K2，发送方用K1加密，K2解密，再用K1加密。接受方用K1解密，K2加密，再用K1解密，这相当于使用______倍于DES的密钥长度的加密效果。 A．1 B．2 C．3 D．6

单选题在下面的活动图(图14-10)中，从A到J的关键路径是{{U}}{{U}}15{{/U}}{{/U}}，I和J之间的活动开始的最早时间是{{U}}{{U}}16{{/U}}{{/U}}。

单选题在CPU执行一段程序的过程中，Cache的存取次数为4600次，由主存完成的存取次数为400次。若Cache的存取周期为5ns，主存的存取周期为25ns，则CPU的平均访问时间为______ns。 A．5.4 B．6.6 C．8.8 D．9.2

单选题 Many of the activities performed during the preliminary investigation are still being conducted in{{U}} {{U}} 37 {{/U}} {{/U}}, but in much greater depth than before. During this phase, the analyst must become fully aware of the{{U}} {{U}} 38 {{/U}} {{/U}}and must develop enough knowledge about the {{U}} {{U}} 39 {{/U}} {{/U}}and the existing systems to enable an effective solution to be proposed and implemented. Besides the{{U}} {{U}} 40 {{/U}} {{/U}}for process and data of current system, the deliverable from this phase also includes the{{U}} {{U}} 41 {{/U}} {{/U}}for the proposed system.

单选题2005年5月4日，张某向中国专利局提出发明专利申请；其后，张某对该发明作了改进，于2006年5月4日又就其改进发明向中国专利局提出申请时，可享有______。

单选题下面有关CMM模型的描述中，不正确的是 (9) 。CMM模型的第三级为确定级，其主要过程是关于项目和组织的策略。以下选项中属于第三级的关键过程是 (10) 。

单选题I/O控制方式有多种， (51) 一般用于大型、高效的计算机系统中。

单选题 UML用关系把事物结合在一起，{{U}} {{U}} 23 {{/U}} {{/U}}描述一个事物发生变化会影响另一个事物的语义；{{U}} {{U}} 24 {{/U}} {{/U}}描述特殊元素的对象可替换一般元素的对象。

单选题Due to a constantly ______ environment, a poor understanding of the user's needs and preferences, as well as a ______ of willingness to modify ______ organizational structures and decision models, the full economic potential of Web Information Systems (WIS) has not been realized by now. The data object types of the ______ meta model, the Extended World Wide Web Design Technique (eW3DT), provide hypertext designers ______ a conceptual, user-centric framework and graphical notation for the construction of both, ______ and customized models, during the software development ______ of commercial WIS. A reference model as a normative concept represents an abstraction of a ______ company, its functional units, or its (Web) Information Systems and is intended to streamline the design and implementation of complex applications at ______ costs. As precondition for pursuing a partial globalization strategy, eW3DT ______ between technical and content-specific responsibilities for designing, implementing, and maintaining WIS.

单选题下面关于系统总线的论述中，不正确的是 (31) 。

单选题逆向工程可用于维护已有的软件，逆向工程能够 (13) 。

单选题信息工程是面向企业计算机信息系统建设，以______为中心的开发方法。信息工程方法认为，与企业的信息系统密切相关的三要素是：企业的各种信息、企业的______和企业采用的信息技术。信息工程自上而下地将整个信息系统的开发过程划分为四个实施阶段，分别是______阶段、业务领域分析阶段、系统设计阶段和系统构建阶段。

单选题由某市标准化行政主管部门制定，报国务院标准化行政主管部门和国务院有关行政主管部门备案的某一项标准，在国务院有关行政主管部门公布其行业标准之后，该项地方标准 (8) 。

单选题 WLANs are increasingly popular because they enable cost-effective connections among people, applications and data that were not possible, or not cost-effective, in the past. For example, WLAN-based applications can enable fine-grained management of supply and distribution{{U}} {{U}} 24 {{/U}} {{/U}}to improve their efficienty and reduce{{U}} {{U}} 25 {{/U}} {{/U}}. WLANs can also enable entirely new business processes. To cite but one example, hospitals are using WLAN-enabled point-of-care applications to reduce errors and improve overall{{U}} {{U}} 26 {{/U}} {{/U}}care. WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure. For example, they can protect corporate data by preventing {{U}} {{U}} 27 {{/U}} {{/U}}through rogue access points. They help control salary costs, by allowing IT staffs to manage larger networks without adding staff. And they can improve overall network mananement by integrating with customers' existing systems, such as OpenView and UniCenter. Fortunately, it isn't necessary to measure these benefits to justify investing in WLAN management solutions, which can quickly pay for themselves simply by minimizing time-consuming{{U}} {{U}} 28 {{/U}} {{/U}}and administrative chores.

单选题在文件管理系统中，位示图(Bitmap)可用来记录磁盘存储器的使用情况。假如计算机系统的字长为32位，磁盘存储器上的物理块依次编号为：0、1、2、…，那么3552号物理块在位示图中的第______个字。