Chordal deviation is the perpendicular distance between the actual curve and the approximating line segments.
圆弧可以大量短直线模拟，弦长偏差是圆弧与直线的垂直距离。
The perpendicular distance from the base of a geometric figure to the opposite vertex, parallel side, or parallel surface.
平行面（底面）且侧面都是平行四边形的多面体。
This method not only keep the curve through the critical points but also with the shortest perpendicular distance, thus restore the critical points.
它满足了一个特殊的要求，即曲线通过全部节点且到弦的垂直距离最短。
Correcting pressure heads perpendicular to detection surfaces are arranged on both sides of the first detection block and used for correcting the distance of a pair of bent pipes on the chassis;
第二检测块上开有可收容部分车架的缺口，用于检测和校正一对弯管与车头管之间的角度；
Correcting pressure heads perpendicular to detection surfaces are arranged on both sides of the first detection block and used for correcting the distance of a pair of bent pipes on the chassis;
第二检测块上开有可收容部分车架的缺口，用于检测和校正一对弯管与车头管之间的角度；
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