A.100m±0.5m B.150m±0.5m C.200m±0.5m D.250m±0.5m
A.135±5mm B.145±5mm C.155±5mm D.150±5mm
A.93~190 B.95~200 C.90~150 D.95~250
A.0 B.252 C.255 D.253
A.地面应答器 B.车站 C.信号机 D.轨道电路