A.10~15mm B.15~20mm C.20~25mm D.25~30mm
A.6~8mm B.8~10mm C.10~12mm D.12~16mm
A.電務(wù)段、工務(wù)段 B.供電段、工務(wù)段 C.車務(wù)站段 D.車務(wù)段(直屬站)、工務(wù)段