副法线球面指标
spherical indicatrix of binormal
大曲率球面面形检测
Testing of large curvature spherical surface
双列球面球轴承
double-row spherical ball bearing
外球面球轴承
Insert Bearing with Housing
insert bearing
outer spherical ball bearing
3-3R球面并联机构
3-3R spherical type parallel mechanism
3-RRR球面并联机构
3-RRR spherical parallel manipulator