Freu弗勒FRabbr.故障率（=failure rate）abbr.故障记录（=faillure record）abbr.故障报告（=failure report）fructofuranosidon.呋喃果糖苷基frenulum pudendi阴唇系带Frenkel movement弗伦克尔运动fructus crataegi山楂frrequency factor[机] 频率因数Fruehjahr catarrh春季结膜炎Fresnel principle菲涅尔原理fructose disorder果糖病症frewarning system预警系统frustum of a cone截头圆锥体,平截圆锥体