audio-frequency push-pull ampli-fier
【电学】频率编码，秘密通讯【电学】频率干扰
frequency scrambling
暂无补充释义。
frequency scrambling
暂无补充释义。
audio-frequency push-pull ampli-fier
relative frequency
relative frequency
Debye frequency【物】
frequency beating
damped natural frequency【物】
３０赫－２０千赫\nacoustic frequency【声】;audible frequency【声】;audio frequency【声】
frequency of occurrence of speech sound【声】