A.2mm,3mm B.2.5mm,3mm C.2mm,2.5mm D.2mm,4mm
A.同一轉向架 B.相鄰轉向架 C.同一車輛 D.相鄰車輛
A.50mm,40mm B.50mm,30mm C.40mm,20mm D.40mm,30mm