three point plane
三点平面
以上为机器翻译结果，长、整句建议使用 人工翻译 。
By means of spherical graphics and plane trigonometry, space angle and space point coodinates are calcullated for three sets of combined fixtures as examples.
运用球面图法及平面三角法，计算了三种组合夹具实例的空间角度及空间点的坐标。
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