NO Octance Number 辛烷值

NOR Notice of Readiness 准备通知

NOSC Naval Ocean Systems Center 海军系统中心

NOTAM Notice to Airmen 航行通告

NS Nuclear Ship 核动力船

NT Net Tonnage 净吨位

OAS Obstacle Assessment Surface 障碍物评价面

OBC On-Board Computer 随车自诊电脑

OBD On-Board Diagnostics 自我诊断

OC Oil Consumption 润滑油消耗量

OCP Olefin Co-Polymer 烯烃共聚物

OCS Operational Control System 操作控制系统

ODALS Omnidirectional Approach Lighting System 全向进近灯光系统

ODI Oil Drain Interval 换油间期

OE Opposed-Cylinder Engine 对置气缸发动机

OH Overhaul 大修

OR Owner's Risk 损失由货主承担(海运业用语)

OS Oxygen Sensor 氧传感器

OXS Oxygen Sensor 氧传感器

P.T.O. Power Takeoff 动力输出