Office of Emergency Preparedness紧急战备局 Operational Evolution Plan操作演化的计划 Office of Environmental Policy环境政策办公室 Optometric Extension ProgramOptometric推广项目 Office of Energy Planning能源计划局 Oil Extraction Process石油提取工艺 Office of External Programs办公室的外部程序 Operand Execution Pipeline执行操作的管道 Optimisation par Essaim Particulaire (French: Particle Swarm Optimization)Essaim Particulaire(par最优化的粒子群优化算法)的法国 Office of Emergency Preparedness (US Department of Health and Human Services)办公室的应急(美国卫生与人类服务部门) Open Enrollment Period (US Medicare)(我们敞开招生期间医疗保险) Oxford Economic Papers牛津经济论文集 Opto-Electronic Plethysmography光电Plethysmography Order of Emmaus Pilgrims (United Church of Christ)马忤朝圣者的基督的教会(美国) Other Equipment & Property其他设备和财产