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通过对传动比成为几何级数时的射线图的分析，提出了拖拉机工作速档的选择方案，并通过实例分析了选择方案，得出了工作速档传动比的几何级数关系。
Based on the analysis of the ray patterns when the gear ratio is a geometric progression, the selection scheme of the tractor working speed is put forward, and the selection scheme is analyzed through an example to get the geometrical series relationship of the working speed ratio.