单词	cost of books
释义	cost of books 书本费留学
随便看	frequency code signal frequency coding frequency-coding frequency-coding converter frequency coding signal frequency-coding system frequency coherence frequency coincidence frequency coincidency frequency coincident technique Frequency,Coital frequency collapse frequency collision frequency comapensation frequency comb frequency combination method frequency combiner Frequency command frequency communication frequency commutation frequency comparator frequency comparator circuit Frequency Compare Pilot frequency comparing pilot frequency comparison