单选题某数据处理流水线如图所示，若每隔3Δt流入一个数据，连续处理4个数据。此数据处理流水线的实际吞吐率为______。

单选题在进行金融业务系统的网络设计时，应该优先考虑 （70） 原则。

单选题假设磁盘上每个磁道划分成9个物理块，每块存放1个逻辑记录。逻辑记录R0， R1，…，R8存放在同一个磁道上，记录的安排顺序如下表所示。 物理块 0 1 2 3 4 5 6 7 8 逻辑记录 R0 R1 R2 R3 R4 R5 R6 R7 R8 假定磁盘旋转一圈的时间为27ms，磁头当前处在R0的开始处。若系统顺序处理这些记录，使用单缓冲区，每个记录处理时间为3ms，则处理这9个记录的最长时间为 (48) ；若对信息存储进行优化分布后，处理9个记录的最少时间为 (49) 。

单选题在Linux 系统中，一般用 （64） 命令来测试另一台主机是否可达。

单选题In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. With the implementation of (66) , the so - called network has become a reality. The provision of such facilities is the most important part of the network requirements. However, in many applications the communicating computers may be of different types. This means that they may use different programming languages and, more importantly, different forms of (67) interface between user(application) program, normally referred to, as application processes, and the underlying communication services may be (68) . For example, one computer may be a small single - user computer, while another may be a large (69) system. In the earlier days of computer communication, these issues meant that only closed communities of computers (that is, from the same manufacturer) could communicate with each other in a meaningful way. IBM's Systems Network Architecture (SNA) and DEC's Digital Network Architecture (DNA) are just two examples of communication software packages produced by manufacturers to allow their systems to be interconnected together. These proprietary packages, however, of which there am still many inexistence, do not address the problem of universal interconnect ability, or open systems interconnection. In an attempt to alleviate this problem, (70) , in the late 1970s, formulated a reference model to provide a common basis (or the coordination of standards developments and to allow existing and evolving standards activities to be placed into perspective with one another.

单选题基于SOA和web services技术的企业应用集成(EAI)模式是______。 A．面向信息的集成技术 B．面向过程的集成技术 C．面向计划的集成技术 D．面向服务的集成技术

单选题设计骨干网时，应该在性能和成本之间寻找平衡。以下叙述中，（ ）是正确的。

单选题在如图所示PKI系统结构中，负责生成和签署数字证书的是______，负责验证用户身份的是______。

单选题在数据库系统中，数据的完整性是指数据的 （45） 。

单选题The analysis phase answers the questions of who will use the system，what the system will do，and where and when it will be used．During this phase，the project team investigates any current system，identifies (71) ，and develops a concept for the new system．This phase has three steps：first， (72) is developed to guide the project team's efforts．It usually includes an analysis of the current system and its problems，and the ways to design a new system．The next step is (73) ．The analysis of this information-in conjunction with input from the project sponsor and many other people-leads to the development of a concept for a new system．The system concept is then used as a basis to develop a set of business analysis models that describes how the business will operate if the new system were developed．The set of models typically includes models that represent the (74) necessary to suppor the underlying business process．Last，the analyses，system concepts，and models are combinedin to a document called the (75) ，which is presented to the project sponsor and other key decision makers that decide whether the project should continue to move forward．

单选题设集合A={a,b,c},A上的二元关系R={,}不具备关系（ ）性质

单选题以下我国的标准代号中，______表示行业标准。

单选题面向团队的需求收集方法能够鼓励合作，为解决方案的各个要素提供建议，协商不同的方法，以及说明初步的需求方案。下列关于面向团队的需求收集方法叙述，不恰当的是（ ）。

单选题目前已经提出的软件开发标准化的方案有（ ）

单选题The software architecture is a set of software components, subsystems, relationships, interactions,the properties of each of these elements, and the set of guiding principles that together constitute thefundamental properties and constraints of a software system or set of systems. ______ defines ageneral set of element types and their interactions. The examples include Pipes and Filters,Model-View-Controller, and Reflection. A ______ in software architecture is a representationused to understand or document one or more aspects of a problem or solution. Architecture is usually usedin conjunction with many adjunct terms. The ______ defines the key strategies, organization, goalsand related processes of the enterprise. At the enterprise level, the ______ may be more of a set ofguidelines on how the various software architectures should be constructed consistently across theenterprise. The ______, which describes the high-level Set of elements involved in applicationfrom a particular domain along with their interactions, is often used to focus on subsystem definitionrather than application process level definition.

单选题试题(28)、(29) 餐厅的点菜过程如下面的UML顺序图所示，现采用命令(Command)模式来实现该场景。那么下面顺序图中，与命令模式中的类Command对应的类是____(28)____；与类Receiver对应的类是____(29)____。

单选题某工厂每年需要铁矿原料100万吨，切假设全年对这种原料的消耗是均匀的。为了减少库存费用，准备平均分多批进货。库存费按平均年库存量（每次进货量的一半）以每万吨500元计算。由于每次进货需要额外支出订单费1000元，所以每次进货次数也不能太多。为节省库存费和订货费总支出，最经济的办法是（58）。

单选题通常将“C:\Windows\myprogram.exe”文件设置成只读和隐藏属性，以便控制用户对该文件的访问，这一级安全管理称之为 （47） 安全管理。

单选题多媒体电子出版物创作的主要步骤为 (57) 。