A.轍叉心軌尖端至心軌寬40mmB.轍叉心軌尖端至心軌寬50mmC.轍叉心軌尖端至心軌寬30mmD.轍叉心軌尖端至心軌寬20mm
A.45~49B.43~49C.45~47D.42~49
A.40B.42C.44D.46