The front roll (active roll)realizes automatic track-propulsion;
前辊（活动辊）实现自动跟踪推进；
The foundation of automatic block and cab signal is track circuit.
自动闭塞和机车信号的基础是轨道电路。
In this paper, the automatic level control system for four track concrete paver is researched.
本文对四履带滑模式水泥混凝土摊铺机自动找平控制系统进行了研究。
In this paper, the automatic level control system for four track concrete paver is researched.
本文对四履带滑模式水泥混凝土摊铺机自动找平控制系统进行了研究。
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