【单选题】【消耗次数：1】
汽车制动时的地面制动力首先取决于
①
制动时转向盘发抖
②
制动时汽车发生跑偏
③
制动时汽车产生异响
④
制动时汽车失去转向能力
参考答案：
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【判断题】
汽车在制动过程中，当制动器制动力大于轮胎－道路附着力时，车轮就会抱死滑移。只有汽车具有足够的制动器制动力，同时地面又能提供较大的附着力时，汽车才能获得较好的制动效果。
①
正确
②
错误
【简答题】
汽车制动方向稳定性是指制动时汽车不发生[填空]、[填空]及[填空]的性能。
【简答题】
汽车制动性的评价指标主要包括[填空] 、[填空]、制动时汽车的方向稳定性。
随机题目
【单选题】
阅读理解：阅读下列短文，回答文后问题，选择最佳答案Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important．In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily；but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago，a rich and powerful country cut down its trees to build warships, with which to gain itself an empire．It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒)．1. According to the passage, which is the most important service of trees to man?
①
A. They help him make money.
②
B. They give him cool.
③
C. They give him wood and other things.
④
D. They help him to stop droughts and floods.
【单选题】
These papers___yet.
①
have not written
②
have not been written
③
has not written
④
has not been written