亚马逊的S3(Simple Storage Service)属于()种云计算服务类型.
亚马逊网上书店是一家以________业务为主的电子商务企业。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
The()technique involves using project characteristics in a mathematical model to predict total project cost. Models can be simple or complex.
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