A.鋼軌件所有螺栓孔 B.僅基本軌、尖軌、長、短心軌螺栓孔 C.間隔鐵螺栓孔 D.僅接頭夾板螺栓孔
A.1:40 B.1:20 C.1:10 D.1:60
A.1:40 B.1:20 C.1:16 D.1:10