FRR=Fiber Reinforced Rubber 纤维增强橡胶FRabbr.故障率（=failure rate）abbr.故障记录（=faillure record）abbr.故障报告（=failure report）Fructus Tritici小麦frenkel vacancy夫伦克耳空位Fruhstorferiolan.腹露蝗属Fructus Tribuli蒺藜FRP/GRP Pipe玻璃铜夹砂管Fresnel contour菲涅耳等值线fructus kochiae地肤子Fructus Piperis胡椒frenum of labia阴唇系带Fresnel biprism菲涅耳双棱镜