frequency zone频率带
frequencyn.频繁;频率
frequency converter circuit变频电路
frequency indicating device频率指示器
frequency-shift converter移频变换器
Frequency hopping sequences跳频序列
frequency response analyser频率特性分析器
frequency conversion-mode变频模式
frequency conversion effect变频效应
frequency of bowel movement大便频数
frequency to access courses上网率
frequency conversion timing变频调速