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-noise motor低噪音马达low estate theory底层理论low melting glaze低温釉,低熔点釉low-rent houses廉租住房low-power range低功率区段low speed printer低速打印机low on ammunition军火供应不足；弹药枯竭low pressure tire低压轮胎low-load period低负荷期low flow mud pump小流量灰浆泵