side dump tractor trailer unit 牵引拖车侧卸设备
tractor paper feed unit [计] [印刷] 输纸牵引部件
tractor feed drive unit 输纸驱动部件
tractor-trailer unit 拖拉机挂车机组
Tractor unit 牵引机车
safety unit of tractor 拖拉机防护装置
tractor-drawn two unit articulated roller 拖式双联路碾
tractor swing-unit 拖拉机悬挂机组
Great care had to be taken with the control systems for a powered trailer because, when turning, it can push the tractor unit over.
在拖车运行时必须谨慎地操纵控制系统，否则牵引机就会被推倒。
Compared with tradition tractor and implement unit, a self propelled machine not only has simple structure, small unit and high efficiency, but also can be used in the paddy field and special area.
自推进耕耘机械与传统的拖拉机农具机组相比，其结构简单，机组短，效率高，适合在水田和特殊地块作业。
Aiming at the technological requirements of tractor wheel hub threading, the electrical and hydraulic control parts for tapping unit combination machine tool were designed.
针对拖拉机轮毂的攻丝工艺的要求，设计了组合攻丝机床的电气与液压控制部分。
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