rated travel,额定行程；标称行程
rated travel time,额定行程时间
rated tube current,额定管电流
rated tube voltage,额定管电压
rated value,额定值
rated valve capacity,阀额定容量
rated voltage factor,额定电压因数
rating attraction force,额定吸力
rating power consumption,额定功耗
rating test,标定试验
ratio chromatism,倍率色差
ratio controller,比值控制器
ratio meter,比率表
ratio of specific heat capacities,比热比
ratio of the pole spacing to the bore diameter of the pole pieces,极靴的间距与孔径比
ratio station,比值操作器
ratio thermometer,比色温度计
raw spectra,原谱
rawinsonde,无线电测风探空仪
reachability,可达性；能达性
reachable set,可达集；能达集
reachable state,可达状态；能达状态
reaction gas,反应气
reaction gas chromatography,反应气相色谱法
reaction interval,反应区间；反应程
reaction wheel,反作用轮
reaction wheel control,反作用轮控制
reactive energy meter[varhour meter],无功电度表[乏时计]
reactive powermeter,无功功率表
read,读
read-only memory(ROM),只读存储器
read-only storage,只读存储器
readability,易读性；可读度；读数精度
reading bridge,读数电桥
reading strain,应变读数
readjustments,重调
readout time,读出时间
real gas critical flow coefficient,真实气体临界流量系数
real-aperture side-looking airborne radar,实孔径侧视雷达
real image,实象
real strain,真实应变
real time,实时
real time analysis,实时分析
real time analyzer,实时分析仪
real-time clock,实时时钟
real time control,实时控制
real-time control system,实时控制系统
real time date processing,实时数据处理
real time expert system,实时专家系统
real time input,实时输入
real time output,实时输出
real time remote control,实时遥控
real time simulation,实时仿真
real time simulation algorithm,实时仿真算法
real time system,实时系统
real time telemetry,实时遥测
real-time trend panel,实时趋势画面
realizability,可实现性；能实现性
realization of international temperature scale,国际温标的复现
rearrangedmolecular ion,重排分子离子
rearrangement ion,重排离子
receiver element,接收器元件
recessed bearing,槽形支承
reciprocal linear dispersion,倒数线色散
reciprocating piston flowmeter,簇复活塞式流量计
reciprocating pump,往复泵
reciprocity calibration,互易法校准
recombination type transducer [sensor],复合型传感器
record,记录
recorder,记录仪
recording,记录
recording anemometer,风速计
recording chart,记录纸
recording clock,自记钟
recording device,记录装置
recording instrument,自记仪器
recording(measuring)instrument,记录（测量）仪器
recording medium,记录介质
recording snow-gauge,自记雪量计
recording sync,记录同步
recording theodolite,自记经纬仪
recovery time,恢复时间
rectangular coordinate type potentiometer,直角坐标式电位差计
rectifier,整流器；纠正仪
rectifier instrument,整流式仪表
rectilinear ordinates recording instrument,直线坐标记录仪
rectilinear vibration,直线振动
recursive estimation,递推估计
recycle chromatography,循环色谱法
redox electrode assembly,氧化还原复合电极
redox potential meter,氧化-还原电位测定仪
reduced capacity trim,低容量阀内件
reduced model,降阶模型
reduced order observer,降阶观测器
reduced viscosity,还原粘度
reducing plane table equipment,归算平板仪
reduction of area,断面收缩率
reduction of length,缩短率
redundancy computer system,冗余计算机系统
redundancy unit,冗余单元；冗余设备
redundant information,冗余信息
reentry control,再入控制
reference block [specimen],比较试块；对比试块；参考试块
reference chart,参比记录纸
reference coil,参考线圈；基准线圈
reference column,参比柱
reference condition,参比条件
reference electrode,参比电极
reference holder,参比物支持器；参比器
reference junction,参比端
reference junciton error(of thermocouple),（热电偶的）参比端误差
(reference junction temperture) compensator,（参比端温度）补偿器
reference line,参比线
reference load calibrating machine,基准测力机
reference material,参比物质
reference model,参考模型
reference operating condition,参比工作条件
reference performance characteristice,参比性能特性
reference pressure,参比压力
reference range,参比范围
reference sample,参比试样
reference signal,参比信号
reference sound intensity,参考声强
reference sound power,参考声功率
rdference sound pressure,参考声压
reference source,参比源
reference standard,参比[考]标准（器）
reference table (of thermocouple),（热电偶的）分度表
reference test pieces,对比试块
reference value,参比值
reference-value method,参比值法
reference-value scale(of a quantity or property),（量或特性）参比值标度
reference variable,参比变量