?非水密门    non-watertight door

?不织布    non-woven fabric

?古巴国家标准    NOR-CUBA (= Norma cubana, Cuba)

?基准,准则(电算)    norm

?常用转速    normal (or normal number of) revolution

?常载船况,正常状况    normal condition

?常载船况    normal condition

?法线力    normal force

?常用马力    normal horsepower

?常用出力    normal output

?法节    normal pitch

?正滑阀    normal slide valve

?常用船速,常用速[率]    normal speed

?常用船速    normal speed

?法向应力    normal stress

?正常推力    normal thrust

?正火及回火    normalized and tempered (NT)

?正常化,正火    normalizing

?无过给引擎    normally aspirated engine

?标称压力    norminal pressure

?标称尺寸    norminal size

?标称应变    norminal strain

?标称应力    norminal stress

?标称迹流    norminal wake

?可揩锚    northill anchor

?委内瑞拉国家标准    NORVEN (= Venezuelische Norm, Venezuela)

?艏鼻,艏鼻护材,根面(焊面)    nose

?鼻头键槽    nose keyway

?艏鼻板    nose plate

?鼻尾线    nose-tail line

?艏鼻缘    nosing

?故障灯    not under command (or control) light

?故障灯    not under command light

?凹口,缺口,凹痕    notch

?缺口杆试验    notch bar test

?缺口脆性    notch brittleness

?缺口底    notch root

?缺口敏感度    notch sensibility

?缺口韧性    notch toughness

?钢丝网过滤器    notch wire filter

?缺口弯曲试验    notch-bend test

?缺口试验    notched test