周期性动作（Periodic Action）：（A）以周期性的动作（或脉冲），取代连续动作；（B）如果已经是周期性的动作，改变它的频率；（C）在脉冲间暂停，并提供额外的...
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将睡眠中周期性动作 periodic limb movements in sleep ; PLMS
睡眠中周期性动作 periodic movements in sleep ; PMS
又称睡眠中周期性动作 periodic movements in sleep ; PMS
周期性肢体动作 periodic movements of sleep
睡眠中周期性肢体动作 periodic movements of sleep ; PMS
周期性消息动作循环 message action cycle
随后斗轮机构及回转机构运行开始取料，变幅机构配合取料作周期性动作。
Afterward the bucket-wheel organization and the swiveling mechanism movement starts to take the material, the amplitude organization matches the conjunction material to make the periodic movement.
该模型的连续性证明的表达式“周期性波动”和“商业周期”，虽然动作既不恒定的持续时间也不恒定的长度。
The continuous character of this model justifies the expressions' cyclical fluctuations' and 'business cycle' although the movements have neither constant duration nor constant length.
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