2. 计算机
  3. Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers (71) throu

Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers (71) throu

admin2018-05-08  41
问题   Cloud computing is a phrase used to describe a variety of computing concepts that involve a large number of computers (71) through a real-time communication network such as the Internet．In science，cloud computing is a (72) for distributed computing over a network，and means the (73) 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 infrastructure layer is built with virtualized compute，storage，and network resources．The platform layer 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 infrastructure layer serves as the (74) for building the platform layer of the cloud．In turn，the platform layer is a foundation for implementing the (75) layer for SaaS applications．
(72)
选项 A、replacement   
B、switch
C、substitute
D、synonym(同义词)
答案D
解析
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