Operations and Maintenance Center操作管理中心 Order Management Center订单管理中心 Oman Medical College阿曼医科大学 Organisation Mondiale du Commerce (French: WTO)Mondiale嘟商业组织(法国) Organização Mundial do ComÉrcio (Portuguese: World Trade Organization)Organização Mundial do ComÉrcio (Portuguese: World Trade Organization) Online Medical Control (Canadian Coast Guard, Rescue Specialist)联机医学控制(加拿大海岸警卫队,救援专家) Orbitel Mobile Communications Ltd.Orbitel移动通信有限公司 Optical Media Converter光学媒体转换器 organic molecular crystal有机分子晶体 Office of Munitions Control军火控制部 Orion Molecular Cloud猎户座分子云 Office of Managed Care保健管理办公室 Office of Motor Carriers办公室的汽车运输 Office of Military Cooperation办公室的军事合作 Outboard Marine Corporation舷外海洋公司