頻率曲線frequencydifferece distortion: 差頻失真frequencyco tant: 頻率常數(shù)frequencydistribution: 頻率分布frequencyamplitude modulation: 調(diào)頻調(diào)幅frequencydivision modulation: 分頻調(diào)制下載手機詞典可隨時隨地查詞查翻譯