圆规;弹簧圆规,小圆规;弹簧圆规;
and the end head on the other end of the right ruler is connected with a bow compass drawing foot through a locking nut.
右直尺另一端的端头通过锁紧螺母连接有圆规画脚。
the end head on the other end of the left ruler is connected with a bow compass positioning pin through a locking nut;
左直尺另一端的端头通过锁紧螺母连接有圆规定位针;
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