1. 定位轴环：set bolt 固定螺栓 | set collar 定位轴环 | set course 定航向
2. 固定环：set cement 凝固水泥 | set collar 固定环 | set hammer 击平锤
3. 固定轴承环,顶梁,定位环,定位轴环：set coil ==> 置位线圈 | set collar ==> 固定轴承环,顶梁,定位环,定位轴环 | set command ==> 置位指令
1. set collar
1. Red Collar factory was set up in the year of 1987 and became a group company in 1995.