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题目:The architecture of a cloud is developed at three layers: infrastructure, platform, and application. The infrastructure ( ) is deployed first to support IaaS (Infrastructure as a Service) services. This layer serves as the ( ) for building the platform layer of the cloud for supporting PaaS (Platform as a Service) ( ). In turn, the platform layer is a foundation for implementing the layer for SaaS applications. 1.layer 2.foundation 3.services 4.application
参考答案:
A、1234
B、3214
C、1324
D、4321
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