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  3. For nearly ten years, the Unified Modeli

For nearly ten years, the Unified Modeli

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问题 For nearly ten years, the Unified Modeling Language (UML) has been the industry standard for visualizing, specifying, constructing, and documenting the（ 1 ）of a software-intensive system. As the（2）standard modeling language, the UML facilitates communication and reduces confusion among project （3） . The recent standardization of UML 2.0 has further extended the language's scope and viability. Its inherent expressiveness allows users to（4） everything from enterprise information systems and distributed Web-based applications to real-time embedded systems.The UML is not limited to modeling software. In fact, it is expressive enough to model（5）systems, such as workflow in the legal system, the structure and behavior of a patient healthcare system, software engineering in aircraft combat systems, and the design of hardware.To understand the UML, you need to form a conceptual model of the language, and this requires learning three major elements: the UML's basic building blocks, the rules that dictate how those building blocks may be put together, and some common mechanisms that apply throughout the UML.（1）____A.classesB.componentsC.sequencesD.artifacts
选项 A.classes
B.components
C.sequences
D.artifacts
答案 D
解析 近十年来，统一建模语言(UML)已经成为工业标准，它可用宋可视化、规范化说明、构建以及文档化软件密集系统中的开发制品。作为事实上的工业标准，UML能够方便项目相关人员的沟通并减少理解上的二义问题。UML 2.0标准扩宽了该语言的应用范围，它所具有的表达能力能够让用户对企业信息系统、分布式Web系统和嵌入式实时系统进行建模。UML不仅能够对软件系统进行建模，实际上，它具有足够的能力去对法律系统中的工作流、病人监护系统中的结构和行为、飞行战斗系统和硬件系统进行建模。为了理解UML，需要具备该语言的概念模型，这需要学习三个主要元素：UML的基本构造块，基本构造块的关系规则和应用这些构造块与规则的通用机制。
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