确认序列号 Ack Sequence Number ; ACK Acknowledment number ; Acknowledge number

确认队列 ack queue

列车确报电报 train out report telegraph

北美联合精确列车控制 NAJPTC

精确序列 Finished sequence

正确的列 correct column

下列句子是正确的 which of the following sentences is right

列车预确报 train advance and out reports

直流精确系列 DC Precise Series