For the control system to work, sensor sampling and control must be performed at periodic intervals.
为了保持控制系统的正常工作，传感器的采样与控制必须按照一定的周期间隔。
The characteristic of the periodic task of control system is analyzed, and a periodic task model is given.
分析了控制系统中的周期性任务特性，给出了控制系统中周期性任务模型。
The periodic system provides better control over inventories than a perpetual system.
与永续盘存相比较，定期盘存提供更好的存货控制。
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