对置活塞发动机?    opposed piston engine

对置气缸式发动机?    opposed-cylinder engine

光学试验台?    optical bench

光学数据通道?    optical data channel

光学式烟度计?    optical smokemeter

汽车尺寸控制图    optimum deisgn

优化设计?    optimum deisgn

孔板式喷嘴?    orifice plate nozzle

振荡器?    oscillator

其他控制装置?    other control systems

除水系统    other control systems

奥托循环?    otto cycle

气门外弹簧?    outer valve spring

排出气体?    outgoing gas

色温    outgoing gas

椭圆形活塞?    oval piston

过热保护装置?    over heating protection system

过热警报装置    over heating protection system

过热警报装置?    over heating warning system

排气口衬套    over heating warning system

总效率?    overall efficiency

喷油总效率?    overall pumping efficiency

溢流管?    overflow pipe

牵引装置的悬伸?    overhang of towing atachment

牵引装置的高度    overhang of towing atachment

顶置凸轮轴发动机?    overhead camshaft engine

顶置气门?    overhead valve

重叠?    overlap

超负荷?    overload

加大气门杆?    oversize valve stem

超速?    overspeed

短冲程发动机?    oversquare engine

氧化型催化剂?    oxidation catalyst

氨氧化物?    oxids of nitrogen

湿度较正系数    oxygen correction

氧校正?    oxygen correction

氧校正    oxygen interference

氧干扰?    oxygen interference

氧传感器?    oxygen sensor

稀混合气    oxygen sensor

臭氧发生器?    ozonator

底盘测功机    ozonator