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（请作答此空）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 founda-tion for implementing the（）layer for SaaS application.A.replacementB.switchC.substituteD.synonym（同义词）

选项 A.replacement
B.switch
C.substitute
D.synonym（同义词）

答案 D

解析

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中级软件设计师

软件水平考试初中高级

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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

Cloudcomputingprovideson-demandservi