A key attribute of the cloud computing story is that of self-service: putting the control in the hands of the user, rather than having system administrators perform tasks on behalf of those users.
云计算的一个关键特征是自助服务：将控制权交给用户，而不是让系统管理员代表用户执行任务。
This curve will attribute changes of speed status and performance of speed control system.
这个曲线图有助于表征机组转速变化状态和速度控制系统的性能。
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