The paper introduces the basic concept of speed-different mode signal system.
介绍速差式信号制式的基本概念；
Different transportation mode has different features in transportation speed, transportation capability, stability and etc, which result in different costs and the level of customer services.
不同的运输方式在运输速度、运输能力、可靠性等方面有着不同的特点，从而导致了不同的成本和客户服务水平。
Flywheel control system has two closed loops, the inner is voltage stabilization loop, other is current loop or is speed loop in different mode.
飞轮控制系统是个多回路系统，内回路为电压稳定回路，外回路在不同的工作模式下分别为电流回路和转速回路。
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