Freg弗雷格FRabbr.故障率（=failure rate）abbr.故障记录（=faillure record）abbr.故障报告（=failure report）Fructus Piperis Longi荜拨fructosyl transferase果糖基转移酶fructus tritici levis[医] 浮小麦freguency transformer变频器Frustulia interpositan.中间肋缝藻frenulum epiglottidis[医] 舌会厌正中襞frustrative nonreward挫折无赏fresnel lenses mirror菲涅尔透镜frequence of mutation突变频率fructification period结实期