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Open Communications Networks Inc.打开通讯网络公司 Oceanographyn. 海洋学 Open College Network开放大学的网络 Open Computer Network开式计算机网络 oculomotor nucleus动眼神经核 Oncology Certified Nurse癌症注册护士 Orange County News Channel加州橘郡新闻频道 Operations Control Number操作控制号码 Optical Carrier Level N光载波级N Operational Company Number经营公司的号码 Operating Company Number (NANPA)经营公司号码(NANPA) Office of Child Nutrition办公室的儿童营养 Of Course Not当然不是 Office Control Number办公室的控制号码 Original Call Number原始的电话号码