Reinsurance Association of America再保险协会 Restricted Access Area违禁上网区 Regional Airline Association区域航空协会 Royal Academy of Arts英国皇家艺术院 Recreation and Amusement Association (Japan; WWII)休闲和娱乐协会(日本二战) Receiving Antenna Array接收天线阵列 Richmond Ambulance Authority救护车的权威。里奇 Regional Application Administrator区域应用管理员 Right Atrial Appendage右心房附件,右心耳 Renin Angiotensin Aldosterone肾素血管紧张素醛固酮(系统) Royal Australian Artillery澳大利亚皇家火炮 Railways Athletic Association铁路体育协会 Royal Artillery Association皇家炮兵协会 Right Atrial Abnormality右房异常 Reconfigurable-Aperture AntennaReconfigurable-Aperture天线