云服务展示了五个基本特征,显示了它们与传统计算方法的关系和差异。五个特征中的哪一个被描述为:消费者可以根据需要单方面的分配计算能力,如服务器时间和网络存储?
Cloud services exhibit five essential characteristics that demonstrate their relation to, and differences from, traditional computing approaches. Which one of the five characteristics is described as: cloud systems control and optimize resource usage by leveraging a metering capability at some level of abstraction appropriate to the type of service.