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multi…wash scrubber｜多级洗涤器rn
municipal pipe｜市政管网rn
Munters｜瑞典蒙特除湿机rn
myriabit｜万位rn
N。B。｜nota bene（note well） （拉丁语）注意rn
narrow band｜窄（频）带rn
narrow tube｜小直径管rn
National Board of Boilerand Pressure Vessel Inspectors｜锅炉与压力容器国家监查局rn
National Bureauof Standards｜国家标准局（美）rn
National Coal Board｜国家煤炭部（英）rn
native rubber｜天然橡胶rn
natural and mechanical bined ventilation｜联合通风rn
natural attenuation quantity of noise｜噪声自然衰减量rn
natural base｜自然对数底；天然地基rn
natural circulation boiler｜自然循环锅炉rn
natural exhaust system｜自然排风系统rn
natural frequency｜固有频率rn
natural smoke exhausting｜自然排烟rn
natural ventilation｜自然通风rn
natural vibration｜自由＇固有＇振动rn
NBBPVI｜National Board of Boilerand Pressure Vessel Inspectors 锅炉与压力容器国家监查局rn
NCB｜National Coal Board 国家煤炭部（英）rn
NC…curve｜噪声评价NC曲线rn
NC…curves｜噪声评价NC曲线rn
nebulization｜喷雾作用rn
nebulize｜喷雾＇将喷得很细的水或水蒸汽送入空气气流＇rn
nebulizer｜喷雾器rn
neck bearing｜颈轴承rn
needle tube｜针形管rn
negative feedback｜负反馈rn
negative number｜负数rn
neglectable｜可以忽略的rn
negligible｜可以忽略的rn
negligible quantity｜可忽略的量rn
net weight｜净重rn
neutral level｜中和界rn
neutral pressure level｜中和界rn
neutral zone｜中和界rn
neutron probe｜中子探测器rn
New British Standard｜新英国标准rn
nib｜尖，尖端；模＇眼＇孔rn
nickel molybdenum thermocouple｜镍钼热电偶rn
night setback｜（自动控制温度控制点的）夜间降低rn
noble gas｜惰性＇稀有＇气体rn
no…fuse breaker｜无熔丝断路器rn
no…fuse circuit breaker｜无熔丝断路器rn
noise｜噪声rn
noise abatement｜消声rn
noise absorption factor｜吸声率＇系数＇rn
noise background｜噪声背景rn
noise band｜噪声频率＇带＇rn
noise bandwidth｜噪声带宽rn
noise control｜噪声控制rn
noise criterion curve｜噪声评价NC曲线rn
noise criterion curves｜噪声评价NC曲线rn
noise rating number｜噪声等级＇评级＇数rn
noise reduction｜消声rn
nominal diameter｜公称直径rn
non azeotropic mixture refrigerant｜非共沸溶液制冷剂rn
non condensable gas purger｜不凝性气体分离器rn
nonabsorbing｜不吸收的rn
nonadiabatic｜非绝热的rn
nonadiabatic humidifier｜非绝热加湿器rn
nonadjustable｜不可调节的rn
non…bleed type controller｜非泄放型调节器rn
noncarbonate hardness｜非碳酸盐硬度rn
nonbustible｜不可燃的rn
nonbustible materials｜非燃烧材料rn
nonbustible partition｜不可燃的隔断rn
non…mon section｜非共同段rn
noncondensable｜不凝的，非冷凝的rn
noncondensable gas｜不凝性气体，惰性气体＇见inert gas＇rn
noncondensable gas purger｜放气器，不凝性气体排除器＇用以排除制冷系统中不凝性气体的装置＇rn
noncorrodibity｜耐腐蚀性rn
nonequilibrium｜不平衡rn
nonfiber｜非纤维rn
nonfiber dust｜非纤维性灰尘rn
nonflammable｜不易燃的rn
non…frost…susceptible｜不易冻＇结霜＇的，对霜冻不敏感的rn
non…fuse breaker｜无熔线断路器rn
non…fusibility｜抗熔性rn
non…fusible｜不易熔的rn
non…ignitable｜不燃的，耐火的rn
noninflammability｜不可燃性rn
noninflammable｜不可燃的，不着火的rn
non…isothermal jet｜非等温射流rn
nonmetallic tube｜非金属管rn
nonoxidizing corrosion inhibitor｜不氧化防蚀剂rn
nonpotable water｜非饮用水rn
nonregenerable｜不能再生的rn
nonreturn valve｜（通风）止回阀rn
nonreversible｜不可逆的rn
nonsaturable｜非饱和的rn
nonsoluble｜不溶的rn
nonstable｜不稳定的rn
non…turbulent｜无扰动的，非紊流的rn
non…uniform bustion｜不均匀燃烧rn
normal｜累年值rn
normal bend｜直角弯头rn
normal coldest 3…month period｜累年最冷三个月rn
normal coldest month｜累年最冷月rn
normal bustion｜正常燃烧rn
normal distribution｜正常＇正态＇分布rn
normal hottest month｜累年最热月rn
normal power of boiler｜锅炉正常＇额定＇输出功率rn
normal pressure burner｜常压燃烧器rn
normal probability curve｜正态概率曲线rn
normal three summer months｜累年最热三个月rn
normal three winter months｜累年最冷三个月rn
nota bene｜note well （拉丁语）注意rn
nozzle assembly｜喷嘴体，喷嘴装配体rn
nozzle bore｜喷嘴孔rn
nozzle chamber｜喷嘴腔rn
nozzle flow meter in tube｜管内喷嘴流量计rn
nozzle in tube｜管内喷嘴rn
nozzle mixing burner｜引射式喷燃器rn
nozzle outlet air supply｜喷口送风rn
nozzle stub｜喷管接头，短喷嘴rn
NTU method｜number of transfer units method 传递单位数法rn
nucleate boiling｜泡核沸腾＇在加热表面上伴随有汽泡生成的沸腾＇rn
number｜数，数值；号，号码rn
number concentration｜计数浓度rn
number of air changes｜换气次数rn
number of plete air change｜全面换气次数rn
number of degree…day of heating period｜采暖期度日数rn
number of revolution per minute｜每分钟转数rn
number of transfer units method｜传递单位数法rn
numbering｜编号＇码＇rn
Nusselt number｜努差系数，努谢尔特准则rn
nut bolt｜带螺帽的螺栓rn
OB｜octave band 倍频（程）带rn
object｜体物；目标＇的＇rn
object staff｜测量用的准尺rn
objectionable｜有异议的，不适宜的rn
objective｜客观的，实体的，目标的rn
objective function｜目标函数rn
objective law｜客观规律rn
objectivity｜客观性rn
oblate｜扁圆的rn
oblique｜倾斜，歪曲；倾斜的；间接的rn
oblique angle｜斜角rn
oblique angle coordinates｜倾斜坐标rn
oblique cut｜斜切rn
obliteration｜消除＇失＇；磨损rn
oblong｜长方＇椭圆＇形rn
obscure｜暗的，模糊的rn
obscure glass｜毛玻璃rn
obscure sound｜模糊的声音rn
obscureness｜不分明，阴暗rn
obscurity｜不分明，阴暗rn
observation｜观察＇测＇，检查rn
observation door｜观察门rn
observation error｜观察误差rn
observation hole｜观察孔rn
observation pipe｜观察管rn
observation port｜观察孔rn
observation station｜观察站rn
observation tube｜观察管rn
observation well｜观测井rn
observation window｜观察窗rn
observatory｜气象台rn
observe｜观察＇测＇；注意到；评述rn
obsolete｜废弃的，陈旧的rn
obstruction｜阻碍，闭塞，遮断，干扰rn
obstruction lamp｜事故灯rn
obstructive matter｜阻碍物质rn
obstructive signal｜故障信号rn
obturation｜封闭，气密rn
obtuse｜钝（角）的，圆头的rn
obviate｜排＇免＇除rn
OCB｜oil circuit breaker 油断路器rn
occupied zone｜活动区rn
octane number｜辛烷值rn
octave｜倍频程rn
octave band｜倍频带，频率范围rn
odd number｜奇数rn
off …balance｜不平衡的rn
office building air conditioning｜办公楼空气调节rn
office building heating｜办公楼供暖rn
offset bend｜叉形件＇管＇，迂回管rn
oil basin｜油池rn
oil bearing wastewater｜含油废水rn
oil box｜油箱rn
oil buffer｜油压缓冲器＇减振器＇rn
oil bunker｜油库rn
oil burner｜油燃烧器rn
oil burning boiler｜燃油锅炉rn
oil burning package boiler｜小型燃油锅炉rn
oil burning stove｜燃油炉rn
oil circuit breaker｜油断路器，油路开关rn
oil cooler｜油冷却器rn
oil distributor｜油道＇为全部磨擦面输送润滑油而在轴或连杆上钻的孔道＇rn
oil…burning boiler｜燃油锅炉rn
oil…fired unit heater｜燃油热风器rn
once…through boiler｜直管式锅炉rn
one way stop return valve｜单向止回阀rn
one…and…two pipe bined heating system｜单双管混合式采暖系统rn
one…drum boiler｜单汽包锅炉rn
one…flue boiler｜单烟道锅炉rn
one…pipe circuit heating system｜单管跨越式采暖系统rn
one…pipe cross…over heating system｜单管跨越式采暖系统rn
one…pipe heating system｜单管采暖系统rn
one…pipe loop circuit heating system｜水平单管采暖系统rn
one…pipe seriesloop heating system｜单管�