微波全景频谱分析仪micro wave all-pictrue frequency spectrum analyzer
中频intermediate frequency
频数分布图chart of frequency distribution【统计】
【电】 波导截止频率waveguide cutoff frequency
复频率表multiple frequency table【电子】
基本频率fundamental frequency
视频群延迟测试仪video frequency group delayed measuring set
低频发电机low-frequency generator