Based on this foundation, basic models of plow-bottom surface are ruled surface and negative constant curvature surface.

据此得出直纹和负常曲率两类曲面可作为犁体曲面的基本模型。

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Based on this foundation, basic models of plow-bottom surface are ruled surface and negative constant curvature surface.

据此得出直纹和负常曲率两类曲面可作为犁体曲面的基本模型。

youdao