Residential Recycling Initiative住宅回收主动权 Renal Research Institute (USA)肾研究所(美国) Research Reactor Institute研究反应堆学院 Risk Reduction Interval减少风险之间的间隔 Rotman Research InstituteRotman研究所 Resource Reservation Interval资源预订区间 Regional Return Initiative (now part of MARRI)(现在的部分地区还主动的例患者) Resource Renewal Institute资源更新 Response to Request for Information回应请求的信息 Raman Research Institute拉曼研究所 Radio Romania International无线电罗马尼亚国脚 Robarts Research InstituteRobarts研究所 Rainforest Rescue International雨林救援国际 Route Relay Interlocking (railway signaling)铁路信号继电器联锁(路线) Recognition Research International识别研究国际