【单选题】【消耗次数：1】
作为道路几何线形设计所依据的车速是（）
①
行驶车速
②
设计车速
③
地点车速
④
区间车速
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当汽车车速为临界车速时，汽车的稳态横摆角速度增益趋于[填空] ；过多转向量越大，临界车速[填空]。
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若使汽车的最高车速小于发动机最大功率对应的车速，则（）。
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汽车的动力性和燃油经济性都变好
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