较深的开关电源的设计知识，如变压器设计，拓扑选择。
Deep switch mode power supply design knowledge, e. g. transformer design, topology selection.
电气线路中多采用带铁芯的电感线圈如变压器、继电器等。
Most of iron-core inductance coils are used in electrical circuit, such as transformer, relay, etc.
熟悉主要部件如变压器，电机，变流器，齿轮箱，牵引系统及列车控制系统等。
Prefer those with knowledge about the main components such as transformer, converter, gear box, motor, traction system, train control system etc.
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