单选题如下图所示的UML序列图中，______表示返回消息，Account应该实现的方法有______。某UML序列图

单选题系统开发计划用于系统开发人员与项目管理人员在项目期内进行沟通，它包括______和预算分配表等。 A．PERT图 B．总体规划 C．测试计划 D．开发合同

单选题统一过程(UP)的基本特征是“用例驱动、以架构为中心和受控的迭代式增量开发”。UP将一个周期的开发过程划分为4个阶段，其中______的提交结果包含了系统架构。 A．先启阶段 B．精化阶段 C．构建阶段 D．提交阶段

单选题高级程序设计语言中用于描述程序中的运算步骤、控制结构及数据传输的是______。

单选题若关系R、S如下图所示，则关系代数表达式π1,3,7(σ3＜6(R×S))与______等价。

单选题At a basic level, cloud computing is simply a means of delivering IT resources as ______. Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, programming tools, even communication services and collaboration ______. Cloud computing began as large-scale Interact service providers such as Google, Amazon, and others built out their infrastructure. An architecture emerged: massively scaled, ______ distributed system resources, abstracted as virtual IT services and managed as continuously configured, pooled resources. In this architecture, the data is mostly resident on ______ "somewhere on the Internet" and the application runs on both the "cloud servers" and the user"s browser. Both clouds and grids are built to scale horizontally very efficiently. Both are built to withstand failures of ______ elements or nodes. Both are charged on a per-use basis. But while grids typically process batch jobs, with a defined start and end point, cloud services can be continuous. What"s more, clouds expand the types of resources available-file storage, databases, and Web services-and extend the applicability to Web and enterprise applications.

单选题正式的技术评审FTR (Formal Technical Review)是软件工程师组织的软件质量保证活动，下面关于盯R的指导原则中不正确的是______。 A．评审产品，而不是评审生产者的能力 B．要有严格的评审计划，并遵守日程安排 C．对评审中出现的问题要充分讨论，以求彻底解决 D．限制参与者人数，并要求在评审会之前做好准备

单选题下面关于集线器与交换机的描述中，错误的是______。

单选题在多媒体的音频处理中，由于人所敏感的音频最高为 (14) 赫兹(Hz)，因此，数字音频文件中对音频的采样频率为 (15) 赫兹(Hz)。对一个双声道的立体声，保持一秒钟声音，其波形文件所需的字节数为 (16) ，这里假设每个采样点的量化位数为8位。 MIDI文件是最常用的数字音频文件之一，MIDI是一种 (17) ，它是该领域国际上的一个 (18) 。

单选题假设系统中有三类互斥资源R1，R2和R3，可用资源数分别为9，8和5。在T0时刻系统中有P1，P2，P3，P4和P5五个进程，这些进程对资源的最大需求量和已分配资源数如表3-2所示。如果进程按______序列执行，那么系统状态是安全的。表3-2进程对资源的需求

单选题当用分支覆盖法对如图4-8所示的程序流程图进行测试时，至少需要设计______个测试用例。A．4B．5C．6D．8

单选题软件能力成熟度模型(Capability Maturity Model，CMM)描述和分析了软件过程能力的发展与改进的程度，确立了一个软件过程成熟程度的分级标准。 在初始级，软件过程定义几乎处于无章法可循的状态，软件产品的成功往往依赖于个人的努力和机遇。在 (1) ，已建立了基本的项目管理过程，可对成本、进度和功能特性进行跟踪。在 (2) ，用于软件管理与工程两方面的软件过程均已文档化、标准化，并形成了整个软件组织的标准软件过程。在已管理级，对软件过程和产品质量有详细的度量标准。在 (3) ，通过对来自过程、新概念和新技术等方面的各种有用信息的定量分析，能够不断地、持续地对过程进行改进。

单选题算法是对问题求解过程的一类精确描述，算法中描述的操作都是可以通过已经实现的基本操作在限定时间内执行有限次来实现的，这句话说明算法具有______特性。

单选题Traditional structured analysis techniques focus upon the flow of (36) within a system. Object-oriented analysis emphasizes the building of real-world models. It examines requirements from the perspective of the classes and objects found in the vocabulary of the (37) domain. Traditional system design method emphasizes the proper and effective structure of a complex system. Object-oriented design method encompasses the process of object-oriented decomposition and a (38) for depicting both logical and physical as well as static and dynamic models of the system under design. Object-oriented programming is a method of implementation in which programs are organized as cooperative collections of objects, each of which represents an (39) of some class, and whose classes are all members of a hierarchy of classes united via (40) relationships.

单选题 (83) 是把对象的属性和服务结合成一个独立的系统单元，并尽可能隐藏对象的内部细节； (84) 是指子类可以自动拥有父类的全部属性和服务； (85) 是对象发出的服务请求，一般包含提供服务的对象标识、服务标识、输入信息和应答信息等。

单选题某客户端在采用ping命令检测网络连接故障时，发现可以ping通127.0.0.1及本机的IP地址，但无法ping通同一网段内其他工作正常的计算机的IP地址，说明该客户端故障是______。

单选题我国著作权法中对公民作品的发表权的保护期限是 (23) 。

单选题要使4个连续的C类网络汇聚成一个超网，则子网掩码应该为______。

单选题假设在系统中一个文件有两个名字，它与一个文件保存有两个副本的区别是 ______。

单选题Networks can be interconnected by different devices. In the physical layer networks can be connected by (31) or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches which operate at data link layer. They can accept (32) , examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process. In network layer, we have routers that can connect two networks. If two networks have (33) network layer, the muter may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message (34) . As an example, gateways between Internet e-mail and X.400 e-mail must (35) the e-mail message and change various header fields.