... Under-power relay 低功率继电器 Under-frequency protection 低频保护 Low-frequency high-voltage test 低频高压实验 ...
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介绍了大型汽轮发电机组频率异常运行的危害和对低频保护的技术要求及准则；
The paper introduced the hazard of large turbine generator operation under abnormal frequency and technical requirements and criteria for low frequency protection.
目的研究低频脉冲磁场对脑缺血再灌注损伤大鼠海马神经元的保护作用。
Objective To investigate the protective effects of low-frequency pulsed electromagnetic field (LFPMF) on neuron following cerebral ischemia-reperfusion injury in rats.
同时算法结合了人眼视觉模型，有效地保护了图像的低频部分和强边缘部分。从而确保了加密图像的视觉效果。
At the same time, combined with the human visual model, our algorithm guarantees the visual impression and protects the low frequency part of image efficiently.
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