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| O ring seal | 密封圈 | |
| OA, Office Automation | 办公自动化 | |
| OASIS, Open Access Same Time Information Service | OASIS | |
| OC, open circuit | 开路 | |
| OCB, oil circuit breaker | 油开关,油断路器 | |
| OCB, overload circuit breaker | 过载断路器 | |
| OPF, optimal power flow | 优化潮流计算,最佳潮流,最优潮流 | |
| OR circuit | 或电路 | |
| OR gate | 或门 | |
| OR, operating range | 工作范围 | |
| OR, operating record | 运行记录 | |
| OR, operating room | 操作室 | |
| OR, order register | 指令寄存器 | |
| OR, output register | 输出寄存器 | |
| Oedipus complex | 伊迪普斯情结,恋母情结 | |
| Ohm, G.S.Ohm | 1787-1854,欧姆,德国科学家 | |
| Oil Pressure Gauge | 机油油压表 | |
| Oliver Heaviside | 奥立弗・海维塞,1850-1925,英国自学成才的电气科学家 | |
| Orsted, H.C.Orsted | 1777-1851,丹麦人,发现电气的磁气反应 | |
| Overspeed Shutdowns | 超速故障停机 | |
| o type backward wave tube | o型返波管 | |
| o type tube | o型超高频电子管 | |
| oat | 氧化物对准晶体管工艺 | |
| object distance | 目标距离 | |
| object function | 目标函数 | |
| object glass | 物镜 | |
| object identification | 目标识别 | |
| object oriented technology | 面向对象技术 | |
| object program | 目标程序 | |
| objective | 物镜 | |
| objective turret | 镜头转轮 | |
| obligation | 义务,责任,职责. We are under an obligation to try to | |
| oblique anode | 倾斜阳极 | |
| oblique deposition | 倾斜淀积 | |
| oblique evaporation | 斜射蒸镀 | |
| obliquely slotted motor | 斜槽式电动机 | |
| obliquity | 倾斜 | |
| observability | 可观测性 | |
| observation | 观测 | |
| observation circuit | 监听电路,监视电路 | |
| observation data | 观察数据 | |
| observation desk | 观测台 | |
| observation door | 观测孔 | |
| observation error | 观测误差 | |
| observation failure rate | 观察失效率 | |
| observation frequency | 观测次数,观测频率 | |
| observation hole | 观察孔 | |
| observation mean life | 观察平均寿命 | |
| observation point | 观测点 | |
| observation port | 观察孔 | |
| observation station | 观察位置 | |
| observation system | 监测系统 | |
| observation system simulation experiment | 观测系统模拟试验 | |
| observation table | 观测台,检查台 | |
| observation window | 观察窗 | |
| observed Q-percentile life | 观察到的Q百等分寿命 | |
| observed data | 观测数据 | |
| observed mean time | 平均观察时间 | |
| observed pulse shape | 被观察的脉冲波形 | |
| observed reading | 测量值 | |
| observed reliability | 观察可靠性 | |
| observed temperature rise | 观察温升 | |
| observed value | 观测值 | |
| observing frequency | 观测频率 | |
| obsolete | 不能用的 | |
| obsolete price | 过期价格 | |
| obsolete project | 过时项目 | |
| obsorbing complex of soil | 土壤吸收性复合体 | |
| obstacle | 阻碍 | |
| obstacle detection | 故障探测 | |
| obstacle indicator | 故障探测器 | |
| obstruction | 妨碍,阻碍,障碍物,干扰 | |
| obstruction light | 障碍灯 | |
| obstruction-free flow area | 有效流动截面 | |
| obtuse | 钝的,钝角的,抑制声音 | |
| obtuse angle | 钝角 | |
| obtuse angle blade | 钝角叶片 | |
| occlusion | 吸气动作 | |
| occulting light | 明暗灯 | |
| occupancy | 占有 | |
| occupation | 占有 | |
| occupation density | 占有密度 | |
| occupational disease | 职业病 | |
| occupational environment | 职业环境 | |
| occupational exposure | 职业性照射量 | |
| occupational hazard | 职业危害 | |
| occupational health | 职业卫生 | |
| occupational risk | 职业性危害 | |
| occupational safety | 职业安全 | |
| occupid state | 填充状态 | |
| occupied frequency bandwidth | 占有频带宽度 | |
| ocean cable | 海底电缆 | |
| ocean current generation | 海流发电 | |
| ocean pullution | 海洋污染 | |
| ocean resources | 海洋资源 | |
| ocean thermal different power plant | 海洋温差发电 | |
| ocean water | 海水 | |
| ocean wave electric generator | 海洋波浪发电机 | |
| octal | 八进制的 | |
| octal base | 八脚管底 |
