LR系列旋转器是一种低剖面齿轮齿条式设计。
The LR series rotary actuator is a low profile rack and pinion design.
为简化旋转楼梯的设计、图示、施工及剖面形状，对螺旋面的形成进行了分析，建立了螺旋面的数学模型。
To simplified the designing, diagram presentation, construction and profile of helicoidal stair, the formation of helicoid is analyzed, and it's mathematical model is studied.
将要画的线段端点坐标旋转还原，画出剖面线。
To draw the section lines by turning back the ends' coordinates of the segments of the lines to be drawn.
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