随着人民生活水平的提高，轿车已逐渐进入百姓家庭，请观察如图所示的一辆小轿车，分析轿车在快速行驶过程中与静止时，哪一种情况下对地面的压强大，为什么？

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上一题下一题 0.0难度选择题更新时间:2019-06-11 02:37:33

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解：轿车静止时，对地面压力等于重力；轿车在快速行驶过程中，车子上方空气的流速大于车子下方空气的流速，因而车子上方气体的压强小于车子下方气体的压强，轿车上下方所受到的压力差形成向上的升力，从而使得轿车对地面的压力小于车的重力．所以轿车在快速行驶过程中对地面的压力比静止时小，而受力面积相同，由p=

\frac{F}{S}

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阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

In Africa, when the antelope（羚羊）wakes up every morning, the first thing ____ comes into his mind is, “I must be able to run ____ (fast) than the fastest lion,____ I will be killed by a lion.” And at just the same time, the lion____ (wake) out of his dream, and the first thingflashing into his mind is: “I must be able to catch up ____ the slowest a ntelope, otherwise I will starve to____ (dead).” So almost at the same moment____ the antelope and the lion jump to their feet, and start____ (run) toward the rising sun.

Such is life whether you are an antelope ____ a lion, you ought to dash forward without hesitation when the sun ____ (rise).

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