Office of Technology Assessment技术评价处 Ontario Telecommunications Association安大略电信协会 Over-The-Air空中 Orthopaedic Trauma Association骨科创伤协会 On-Time Arrival准时到达 Occupational Therapists' Association职业疗法医生协会 Orthodontic Technicians Association (UK)矫正人员协会(英国) Organized Team Activity组织团队活动 Out of the Air (pricing methodology)从空气(定价方法) OpenTravel AllianceOpenTravel联盟 Oklahoma Technology Administrators俄克拉何马州技术管理者 Oracle Training Administrator/Administration管理培训管理/神谕 Operational Test Agency运行测试机构 Occupational Therapy Assistant助理职业治疗师 Operational Transconductance Amplifier运算跨导放大