?斜度角,后倾角(螺桨)    rake angle

?螺叶后倾    rake of blade

?斜度率,后倾率(螺桨)    rake ratio

?斜艏柱    raked stem

?撞锤    ram

?撞锤冲击试验机    ram impact testing machine

?撞锤冲击试验机    ram impect testing machine

?冲击比    ram ratio

?冲击艏柱    ram stem

?撞锤张力机    ram tensioner

?冲击喷射    ram-jet

?冲击牵条,冲击扣    ramming stay

?跳板,着陆板,艉斜道(艉拖网渔船)    ramp

?坡道    ramp way

?随机负荷    random load

?随机程序    random process

?随机取样试验    random sampling test

?航程,灶,射程,范围    range

?距离误差    range error

?测距仪    range finder

?后艉灯    range light (or after range light)

?稳度范围    range of stability

?视线范围    range of visibility

?郎肯循环    Rankine cycle

?菜油    rape oil

?菜子油    rapeseed oil

?防鼠板    rat guard

?防鼠    rat proof

?防鼠构造    rat proof construction

?棘轮摇钻    ratchat drill (or brace)

?棘轮    ratched wheel

?棘轮与爪    ratchet and pawl

?棘轮摇钻    ratchet brace (or drill)

?棘轮曲柄钻    ratchet brace (or drill)

?棘轮装置    ratchet gear

?棘轮    ratchet wheel

?手动锚机    ratchet windlass

?燃烧率    rate of burning

?膨胀率    rate of expansion

?穿透率    rate of penetration (ROP)

?转向速率指示计    rate of turn indicator

?重量损失率    rate of weight loss