TOCS consists of four parts: ground equipment, __________________, signal data transmission network and onboard-ground information transmission equipment. TOCS由四部分组成:地面设备、__________________、信号数据传输网络和车载地面信息传输设备。
A、train control equipment 列控设备
B、on-board equipment 车载设备
C、safety guarantee equipment安全保障设备