单项选择题
A.MasterClock，MasterClock，SRS1&SRS2，BKP B.MasterClock，SRS1，SRS1&SRS2，BKP C.MasterClock，MasterClock，SRS1&SRS2，SRS1 D.SRS2，MasterClock，SRS1&SRS2，SRS
A.信号机引导 B.设置临时限速 C.取消道岔预留 D.解除允许锁闭
A.Modbus B.GENA C.NTP D.UDP