Top-down method is used first in global designing stage, and then bottom-up method is used in layout design.

首先采用自顶向下的方法进行版图全局规划，然后采用自低向上的方法绘制版图。

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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.

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。

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