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给出了拖拉机在有无配重两种状态下质心坐标的换算公式，从而给出了只测定一种状态的质心坐标，即可利用换算公式计算另一状态的质心坐标的方法。
The conversion formula of the center of mass and the center of mass of the tractor with or without the weight is given. The method of calculating the centroid coordinates of another state by using the conversion formula is given.