frequency beat频率差拍
frequencyn.频繁;频率
frequency measuring decade测频十进位
frequency difference limen频率辨差阈
frequency prediction chart频率号测图表
frequency dividing control分频控制
frequency synthesis source频综源
Frequency Determining Unit频率测定器
frequency conversion power变频电源
frequency-varying timing变频调速
frequency signal generator频率信号发生器
frequency band of emission发射频带