Cloud computing is a phrase used to desc

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问题 Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers （）through a real-time communication network such as the Internet. In science, cloud computing is a （）for distributed computing over a network, and means the （）to run a program or application on many connected computers at the same time.The architecture of a cloud is developed at three layers: infrastructure, platform, and application. The infrastucture layer is built with virtualized computestorageand network resources. The platform lay-er is for general-purpose and repeated usage of the collection of software resources. The application layer is formed with a collection of all needed software modules for SaaS applications. The infrastucture layer serves as the （）for building the platform layer of the cloud. In turn, the platform layer is foundation for implementing the （请作答此空）layer for SaaS application.A.resourceB.serviceC.applicationD.software

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答案 C

解析云计算是一个用来描述各种计算概念的一个短语，计算概念涉及大量计算机通过实时通信的网络，如Internet，（1）在一起。在科学研究中，云计算是分布式网络计算的（2），意味着有（3）同时在多台互连的计算机上运行一个程序或应用。云的结构分为3层：基础设施、平台和应用。基础实施层由虚拟计算机存储和网络资源构成；平台层是具有通用性和复用性的软件资源的集合；应用层是云上针对SaaS应用的所有应用软件的集合。基础设施层时建立平台层的（4）基础；相应地，平台层是执行应用层SaaS（5）的基础。A. 资源 B. 服务 C. 应用 D. 软件

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Cloud computing is a phrase used to desc

中级软件设计师

软件水平考试初中高级