A.2mm,3mm B.3mm,2mm C.4mm,2mm D.2mm,4mm
A.2mm,3mm B.2.5mm,3mm C.2mm,2.5mm D.2mm,4mm
A.同一轉(zhuǎn)向架 B.相鄰轉(zhuǎn)向架 C.同一車(chē)輛 D.相鄰車(chē)輛