... lowfrequency低频 lowfrequency低频率 lowgradecoal劣质煤 ...
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lowfrequency radio telescope 低频射电望远镜
lowfrequency horn 低音喇叭
ultr lowfrequency 超低频
lowfrequency acquisition 低频探测
lowfrequency magnetic communication 低频磁通信
lowfrequency iron core inductance 低频铁芯电感
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