freq[电] 频率FRabbr.故障率（=failure rate）abbr.故障记录（=faillure record）abbr.故障报告（=failure report）Fregata minor Lesser Frigate Bird小军舰鸟Fre-quency Analysis and Control频率分析与控制Fresnel straight edge diffraction菲涅耳直边衍射frequence of infinite attenuation［信］无限衰减频率Fructus Hordei Germinatus tabletsfrenulum veli medullaris superius上髓帆系带frenulum veli medullaris superior颅侧髓帆系带fre-quency division multiplexing频分复用fructus cinnamomi cassiae immaturi[医] 肉桂子Frere Cosme's intra urethral knife