Now that you have a clean way to retrieve the list of courses and maintain that data in a context variable managed by Seam, it is time to branch off from the course listing.
既然已经清楚检索课程列表以及在seam托管的上下文变量中维护该值的方法，下面研究课程列表以外的内容。
Variable sliding mode control had been developed to an important branch of the modern control theory.
滑模变结构控制理论是现代控制理论的一个重要分支。
Based on the branch-current-based current method, this paper presented a three-phase state estimation method for Distribution where the load current is considered as the state variable.
在基于支路电流的三相配电网状态估计的基础上提出了以负荷电流为状态变量的配电网的三相状态估计方法。
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