A.30 B.60 C.90 D.120
A.踏面擦傷長度<30mm,深度<0.5mm B.踏面擦傷長度<60mm,深度<0.5mm C.踏面擦傷長度≤30mm,深度≤1mm D.踏面擦傷長度≤60mm,深度≤1mm
A.26-34mm B.23-33mm C.26-33mm D.23-34mm