low NO低NOx燃烧lowadj.低的；少的；低落的；低声的；卑劣的；低等的adv.低地；低声地；低下地；廉价地n.低水平；低价；低谷v.哞哞叫low-sulphur fuel低硫燃油Low and hot valley低热河谷区low energy circuit低能量电路low-speed memory[计] 低速存储器low-tension wire低压线,低压电线low traffice hours低业务量时间low lift head pump低扬程泵low contrast image低对比影像low-Illumination低照度low tide shoreline低潮岸线