移頻按鍵 audio frequency shift keying: 聲頻移頻健控binary frequency shift keying: 二進(jìn)制移頻鍵控binary frequency-shift keying: 二進(jìn)制頻率變換調(diào)制double frequency shift keying: 雙頻移鍵控; 雙移頻鍵控fast frequency shift keying: 快速移頻鍵控下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯