?额定马力    rated horsepower

?额定出力    rated output

?额定功率    rated power

?额定寿命    rating life

?比,比率,比值    ratio

?桅索梯    ratlines (or ratlings)

?藤碰垫    rattan fender

?原料    raw material

?反动轮叶    reaction blade

?反动式舵    reaction rudder

?反应级    reaction stage

?反动级    reaction stage

?反作用应力    reaction stress

?反动涡轮机    reaction turbine

?原子炉,电抗器    reactor

?真螺距    real pitch

?真滑流    real slip

?真滑流率    real slip ratio

?实时作业    real-time operation

?绞刀    reamer

?绞孔螺栓    reamer (or rimer) bolt

?绞孔凿    reaming iron

?绞孔机    reaming machine

?列氏温度计    Reaumur thermometer

?再辉点    recalescent point

?接收机,接受器,听筒,收报机    receiver

?接收天线    receiving antenna

?接收天线多耦器    receiving antenna multicoupler

?凹[入]部    recess

?凹入舱壁    recess bulkhead

?往复机    reciprocating engine

?往复机,往复引擎    reciprocating engine

?往复泵    reciprocating pump

?交替定理    reciprocity (or recipro- cal) theorem

?推算船位    reckoning (or dead recking)

?重新入级    reclassification

?建议案    recommendation

?记录器    recorder

?方形锅炉    rectangular boiler

?矩形导波管    rectangular wave guide

?整流器    rectifier

?复热式热交换器    recuperative heat exchanger