Return On Investment投资回收率 Release of Information (hospitals/patients)发布的信息(医院/患者) Royal Institute of Oil Painters（英国）皇家油画家协会 the Republic of Ireland爱尔兰共和国 Radiological Operating Instructions辐射作业指导书 RAM Optical InstrumentationRAM光学仪器 Region of Interest兴趣区,感兴趣区,感兴趣部位 Reactive Oxygen Intermediate反应氧中介物 Republic Of Ireland爱尔兰共和国(欧洲) Radius Of Influence影响半径 Record of Invention记录的发明 Remote Operator Interface远程操作员接口 Route of Ingress路线的入口 Return of Investment投资回报 Rate of Interest利率