【填空题】
22117.___与超声传感器相比，红外测距的准确度更高。
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【填空题】
22155.___为减少机械传动部件的扭矩反馈对电机动态性能的影响，机械传动系统的基本固有频率应低于电气驱动部件的固有频率的 2～3 倍，同时，传动系统的固有频率应接近控制系统的工作频率，以免系统产生振荡而失去稳定性。
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