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| octal debugger | 八进制调试程序 | |
| octal digit | 八进制数字 | |
| octal loading program | 八进制装入程序 | |
| octal multiplication | 八进制乘法 | |
| octal notation | 八进制计数法 | |
| octal number | 八进制数 | |
| octave | 倍频程 | |
| octave frequency band | 倍频带 | |
| octode | 八极管 | |
| ocular lens | 目镜 | |
| odd | 奇数的 | |
| odd check | 奇数检查 | |
| odd even check | 奇偶校验 | |
| odd function | 奇函数,正弦函数是奇函数 | |
| odd harmonic | 奇次谐波 | |
| odd harmonic function | 奇调和函数 | |
| odd parity check | 奇数的奇偶校验 | |
| odd quantum number | 奇量子数 | |
| odd symmetry | 奇对称 | |
| odd winding | 奇数绕组 | |
| ode | 定向腐蚀剂 | |
| oeic | 光电子集成电路 | |
| oersted | 奥斯特(磁场强度单位) | |
| oerstedmeter | 奥斯特计 | |
| off | 断开 | |
| off center dipole | 偏离中心的偶极子 | |
| off center p.p.i | 偏中心平面位置显示器 | |
| off center plan display | 偏中心平面位置显示器 | |
| off chip amplifier | 片外放大器 | |
| off chip connection | 芯片外连接 | |
| off chip resistor | 片外电阻 | |
| off condition | 截止状态 | |
| off contact | 触点断开 | |
| off hook | 摘机 | |
| off hook circuit | 闭合电路 | |
| off load voltage | 开路电压 | |
| off peak demand | 非峰值需量 | |
| off peak load | 非峰值负载 | |
| off peak periods | 非峰值期间 | |
| off peak rate | 非峰值收费 | |
| off position | 开始状态,开路位置,断路位置 | |
| off resistance | 关态电阻 | |
| off shore drilling | 海底钻探 | |
| off state | 断开状态 | |
| off state current | 断态电流 | |
| off state voltage | 断态电压 | |
| off the gold standard | 放弃金本位 | |
| off the shelf integrated circuit | 现用集成电路 | |
| off time | 关机时间 | |
| off transistor | 截止晶体管 | |
| off-line | 离线 | |
| off-line analysis | 离线分析 | |
| off-line control | 脱机控制 | |
| off-line data processing | 离线数据处理 | |
| off-line data transmission | 离线数据传送 | |
| off-line equipment | 离线设备 | |
| off-line mode | 脱机方式 | |
| off-line operation | 离线操作 | |
| off-line output | 离线输出 | |
| off-line printer | 离线打印机 | |
| off-line processing | 离线处理 | |
| off-line processor | 离线数据处理装置 | |
| off-line stability analysis | 离线稳定分析 | |
| off-line storage | 脱机存储器 | |
| off-line test | 离线试验 | |
| off-line testing | 离线试验 | |
| off-line unit | 离线单元 | |
| off-line working | 离线工作 | |
| off-road motor transport equipment | 越野汽车运输装备 | |
| off-standard | 不合标准的 | |
| off-standard product | 非标准品 | |
| off-standard voltage | 非标准电压,不合标准电压 | |
| office | 局 | |
| office busy hour | 电话局忙时 | |
| office cable | 局内电缆 | |
| office call | 局内呼叫 | |
| office code | 局名码 | |
| office communication | 局内通信 | |
| official standard | 法定标准,正式标准 | |
| offset | 偏置,残余误差 | |
| offset carrier | 偏离载波 | |
| offset frequency | 偏频,偏移频率 | |
| offset gate fet | 补偿栅场效应晶体管 | |
| offset standard | 调偏标准 | |
| offset subcarrier system | 副载波偏置系统 | |
| og | 或门 | |
| ohm | 欧 | |
| ohm's law | 欧姆定律 | |
| ohmammeter | 欧安表 | |
| ohmic bridge | 电阻电桥 | |
| ohmic contact | 欧姆接触 | |
| ohmic drop | 有功电压降 | |
| ohmic junction | 欧姆接合 | |
| ohmic losses | 欧姆损耗 | |
| ohmic metallization | 欧姆接触金属化 | |
| ohmic resistance | 欧姆电阻 | |
| ohmic short | 欧姆短路 | |
| ohmmeter | 欧姆计 | |
| oic | 光集成电路 | |
| oil | 油 |
