1s用力呼气容积
Forced expiratory volume in one second
拖拉机差速器壳
tractor differential case
拖拉机差速器油面
tractor differential oil level
拖拉机差速器转向
tractor differential steering
拖拉机产品模块化设计
The modular design of tractor production
拖拉机车轮轴承调整
tractor wheel bearing adjustment
拖拉机储气筒排放阀
tractor air reservoir drain valve
拖拉机传动系液压系统
tractor power train hydraulic system
拖拉机插座接头
tractor receptacle connector