并揭示了降低滚动阻力系数也是提高汽车燃油经济性的重要措施之一。

Furthermore, it is expounded that reducing the coefficient of rolling resistance is one of the important methods to improve fuel economic character of the automobile.

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采用多车速滑行试验法和功率法对两段法计算结果进行验证，证明了采用两段滑行试验法计算汽车滚动阻力系数和空气阻力系数的正确性。

Then, multi-ample coasting-own data and power calculation method were applied to verifying the results. The results show that the two-stage coast-down test method is correct and feasible.

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采用多车速滑行试验法和功率法对两段法计算结果进行验证，证明了采用两段滑行试验法计算汽车滚动阻力系数和空气阻力系数的正确性。

Then, multi-ample coasting-own data and power calculation method were applied to verifying the results. The results show that the two-stage coast-down test method is correct and feasible.

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