audio frequency and video frequency processing
correlation in frequency domain and frequency domain
High frequency and low frequency
Low Frequency and Acoustic Frequency
Low Frequency and Medium Frequency Therapy Equipment
theoretical frequency and actual frequency
idling
怠速
空转
空
空载
无效
闲置
闲
惰走
空转空载
火成侵入
空运转
(Ultra) high frequency time series
~(87)Rb atomic frequency standard
10 kV frequency converter