XML是互联网联合组织创建的一组规范,XML是开放的,是(10)标准。XML主要有(11)等三个要素,为了增强XML文件结构化要求,一般要使用XML的辅助技术(12)。
如果数据库应用系统的用户表中存有用户登录口令,则应该(52)。
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需求分析阶段要生成的文档是(53)和数据字典。
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计算机性能评测分为评估和测试两种方法,其中评估是基于一些原始数据进行推算。(42)用于评价同一厂商生产的同一计算机系统的定点运算速度比较正确;(43)可用于比较和评价在同一系统上求解同一问题的不同算法的性能;(44)是美国用来限制计算机出口的系统性能指标估算方法。
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有关概念结构设计,下列说法正确的是(54)。
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Rapid advances in computer and communication technologies have resulted in the(71) merger of these two fields. The lines have bluned among computing, switching, and digital transmission equipment, and the same digital techniques are being used for data, voice, and image transmission. Merging and evolving technologies, coupled with increasing demands for efficient and timely collection, processing, and(72) of information, are leading to the development of(73) that transmit and process all types of data. The ultimate goal of this evolution is something its proponents-some of the most powerful forces in the computing and telecommunications industries-call the (74) .The (74) will be a worldwide public telecommunications network that will deliver a wide variety of services. The (74) will be defined by the standardization of user interfaces, and will be implemented as a set of digital switches and paths supporting a broad range of traffic types and providing (75) processing services. Inpractice, there will be multiple networks, implemented within national boundaries, but from the user's point of view there will be a single, uniformly accessible worldwide network.
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存在非主属性部分依赖于码的关系模式属于(55)。
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在软件项目估算时,将代码行LOC和功能点FP数据在两个方面使用:一是作为一个估算变量,度量软件每一个(45)的大小;一是联合使用从过去的项目中收集到的(46)和其他估算变量,进行成本和(47)估算。
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不属于数据库逻辑结构设计的任务。
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Even though current technologies make the ultimate segmented network impractical, new technologies and products hold the promise of making the concept a reality. Most important of all these new technologies are (66) . The ultimate switched LAN, which is technically possible, now, exhibits the following characteristics:
1. High-speed yet cost-effective switching devices can be implemented on a wide scale, providing dedicated connections for individual users and supporting the aggregate (67) of all networked users.
2. The ability to deploy switching capabilities incrementally into the (68) base. Switching implementations support switching of individual users or groups so that existing users of shared media modules can continue to use the existing equipment until they can justify moving to dedicate switched LAN connections.
3. Support and enhancement of existing routed environments. Switching (69) routint, but rather can be introduced into the network without making any changes to the existing routing equipment or configuration.(70) play a critical role in the integration of switching into existing networks.
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数据仓库的多维数据模式中不包括(57)。