RRA=Radiation Research Association 辐射研究协会[英]RRabbr.无线电航向信标（Radio Range-beacon）；无线电接受器（Radio Receptor）；阻力比（Resistance Ratio）；连流继电器（Reverse Relay）rrequency-division调谐能量Rrelict Gull Reserve遗鸥自然保护区rregeneration system再生体系RR Wheel Speed Sensor右后轮速感知器Rrural surplus labour农村富余劳动力Rreal-time database实时数据库Rrational use of drugs合理用药Rrespiratory department呼吸内科Rrheological properties流变特性rrual township hospital乡镇卫生院