Its shape was obtained by installing a circular ring at the confluence point of two conical revolutions.
在两个圆锥形旋转的交汇点安装一个圆环就构成了楼梯整体的基本形状。
The head center of the soldering iron head is provided with a centering pin positioned at the center point of the circular ring circle and rising a little altitude than the circular ring plane.
在所述烙铁头的头部中心有一定心针，该定心针位于圆环的圆心处，高度略微高出圆环平面。
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