opening valve time,開閥時間

operating conditions,工作條件

operating error,工作誤差

operating infulence,工作條件影響

operating limits,极限工作條件

operating period,工作周期

operating pressure differential,工作壓差

operating system (OS),操作系統

operating temperature range,工作溫度范圍

operating time,工作時間

operational amplifier,運算放大器

operational reliability,運行可靠性

operational research model,運籌學模型

operational unit,運算器

operations research,運籌學

operative limits,极限工作條件

operator,操作員

operator command,操作員命令

operator's console,操作員操縱台

operator's station,操作員站

optic fiber displacement meter,光纖式位移計

optic fiber position measuring instrument,光纖式位置測量儀

optic fiber pressure transducer,光纖壓力傳感器

optic fiber tachometer,光纖式轉速表

optic fiber tachometric transducer,光纖式轉速傳感器

optical arm length,光臂長度

optical Doppler effect,光的多普勒效應

optical fiber,光導纖維

optical fiber chemical sensor,光纖化學傳感器

optical fibre magnetometer,光纖磁強計

optical fiber sensor,光纖式傳感器

optical(measurement)method,光測法

optical micrometer,光學測微器

optical plummet,垂准儀；光學對中器

optical pumping,magnetometer,光泵磁強計；光泵磁力儀

optical(quantity)transducer(sensor),光（學量）傳感器

optical reading range,光學讀數范圍

optical spectrometer,光學光譜儀

optical system,光學系統

optical theodolite,光學經緯儀

optical vibrometer,光學測振儀

optical wedge micrometer,光楔測微器

optima estimation,最优估計

optimal control,最优控制

optimal control law,最优控制律

optimal control system,最优控制系統

optimal control theory,最优控制理論

optimal decision problem,最优決策問題

optimal solution,最优解

optimal strategy,最做出策略

optimality principle,最优性原理

optimization,（最）优化

optimization layer,优化層

optimization technique,最优化技術

optimum frequency,最佳頻率

order,有序

order parameter,序參數

ordinary temperature thermistor,常溫熱敏電阻器

organic semiconductor gas transducer [sensor],有机半導体气体傳感器

organic semiconductor humidity transduce [sensor],有机半導体濕度傳感器

organic semiconductor thermistor,有机半導体熱敏電阻器

orientation,定向

orientation control,定向控制

orifice,節流孔

orifice plate,孔板

orifice-and-plug flowmeter,錐塞式流量計

original system,原系統

originator,源發站

orthogonal distrortion,正交畸變

ortho-projector,正射投影儀

oscillating period,振蕩周期

oscillator,振蕩器

oscillograph,錄（示）波器

oscillographic polarograph,示波极譜儀

oscilloscope,示波器

outboard rotor,外重心轉子

outdoor location,戶外場所

outer package,外包裝

outlier,剔除值

output device,輸出單元；輸出設備

output equation,輸出方程

output error,輸出誤差

output feedback,輸出反饋

output fluctuation,輸出波動

output force or torque stability,輸出激振力或力矩的穩定性

output impedance,輸出阻抗

output impedance of microphone,傳聲器輸出阻抗

output information,輸出信息

output matrix,輸出矩陣

output noise,輸出噪聲

output prediction method,輸出預估法

output shaft rotation clearance,輸出軸間隙角

output shaft rotation range,輸出軸轉角范圍

output shaft torque,輸出軸轉矩

output signal,輸出信號

output signal "one" level,輸出信號﹛1﹛電平

output signal "zero" level,輸出信號﹛0﹛電平

output state,輸出狀態