frequency meter

频率计

1. 频率计：frequency factor 频率因子 | frequency meter 频率计 | fresh air 新鲜空气

2. 频率表：frequency measurement by vibrationg reed indicator,用舌簧频率计测频 | frequency meter,频率表 | frequency of the natural hydraulic mode,液压固有频率

3. 测频计;频率计：frequency 频率 | frequency meter 测频计;频率计 | frequency modulation 调频

4. 频率表,频率计：frequency meter 频率表 | frequency meter 频率表频率计 | frequency meter 频率计