The north-seeking system equipped in chariots is the orientational instrument based on this elementary principle. 车载寻北仪便是应用上述基本原理工作的定向仪表。
And the on-board computer expert system adopting the expert system structure widely based on the knowledge and the reasoning rules accomplishes the fault diagnosis. 车载计算机故障诊断专家系统采用应用广泛的基于知识的专家系统结构，通过规则进行推理来实现机车电传动电路的故障诊断任务。
