汽车后刹车灯的光源,若采用发光二极管,则通电后亮起的时间会比采用白炽灯大约快0.5秒,故有助于后车驾驶员提前作出反应,即遇到紧急情况时可提前0.5秒刹车.在限速110km/h的高速公路上,行车安全距离约可以减少（）A3m B7m C15m D25m
人气：360 ℃ 时间：2019-11-22 22:57:15
解答
110÷3.6×0.5=15.27m
C不客气
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