Osaka Action Agenda大阪行动议程 Open Application Architecture开放式应用体系结构 Obstetric Anaesthetists' AssociationAnaesthetists产科协会 Organic Acidemia Association (Plymouth, MN)有机血症协会(普利茅斯、锰) On Air Activation在空气中激活 Ohio Aquaculture Association俄亥俄州养殖协会 Ontario Accommodation Association (Canada)加拿大安大略省住宿协会 Oklahoma Aquaculture Association俄克拉何马州养殖协会 Open Agent Architecture开放代理建筑 Old Age Assistance老年救济,老年补助 Ontario Association of Architects安大略建筑师协会 Out and Aboutadj. 能外出走动 Owner Agency Agreement (commercial real estate)所有者代理协议(商业地产) Office of Academic Affiliations (Department of Veterans Affairs)办公室的学术背景(退伍军人事务部) Open Access Architecture (West Wave)开放存取建筑(西波)