The foot portion at its engagement surface has an axial length.
足部在其接合表面处具有轴向长度。
The inner foot portion at its engagement surface has an axial length.
内足部在其接合表面处具有轴向长度。
It is also preferable that the ratio of the axial length of the inner foot portion at its engagement surface to the axial length of the foot portion at its engagement surface is greater than 0.5.
优选的，内足部在其接合表面处的轴向长度与足部在其接合表面处的轴向长度的比值大于0.5。
应用推荐