By using the Beidou____________ and automatic operating system , the train can automatically start, run between stations, adjust its timing according to the schedule, accurately stop at a station, and open and close its doors. 通过使用北斗______________和自动运行系统，列车可以自动启动，站间运行，根据时刻表调整其时间，准确停靠站，打开和关闭其车门。
A、Navigation Satellite System卫星导航系统
B、Big data大数据
C、intelligent patrol robot 智能巡逻机器人