[作業(yè) 運(yùn)輸] 聯(lián)合頻率 combination frequencies: 組合頻率combination frequencies and overtones: 頻率及倍頻聯(lián)合frequencies: 頻數(shù)分布分析allocation of frequencies: 頻率分配band of frequencies: 頻率帶下載手機(jī)詞典可隨時(shí)隨地查詞查翻譯