【单选题】【消耗次数：1】
汽车制动的全过程包括（??）。
①
驾驶员反应时间、制动器的作用时间和持续制动时间
②
驾驶员反应时间、持续制动时间和制动力的消除时间?
③
制动器的作用时间、持续制动时间和制动力的消除时间
④
驾驶员反应时间、制动器的作用时间、持续制动时间和制动力的消除时间
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相关题目
【简答题】
绘图说明汽车在制动过程中地面制动力、制动器制动力及附着力之间的关系。
【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
随机题目
【多选题】
These seats are_____________ for old and sick people.
①
seen
②
driven
③
kept
④
reserved
【多选题】
Suddenly,_____________ , a good idea came to her.
①
to her disappointment
②
to her great joy
③
to her surprise
④
to her delight
【多选题】
The river_____________ the two towns.
①
finds a way
②
keeps apart
③
separates
④
leads to
【多选题】
She expressed her opinions_____________ change their ideas.
①
so that
②
so as to
③
in order to
④
in order that
【多选题】
All the students in our school ____________ in the hall to hear a lecture.
①
collected
②
gathered
③
assembled
④
doubled
【多选题】
This story_____________ a very brave (勇敢的) young girl.
①
is to
②
is about
③
concludes
④
concerns
【单选题】
Computer are being used more and more____________ in the world today.
①
extensively
②
expensively
③
exclusively
④
exactly
【单选题】
Anger is a normal emotion that we all feel from time to time. Some people express anger openly in a calm reasonable way. Some explode with anger, and scream and shout. But other people keep their anger inside. They can not or will not express it. This is called repressing anger. Many doctors think that repressing anger is more dangerous to a person’s health than expressing it. They say that when a person is angry, the brain gives out the same hormones (荷尔蒙) as that are produced during tense and nervous situations. They speed the heart rate and raise blood pressure, so the person feels excited and ready to act. Repressing these feelings will only make the feelings continue, and this can lead to many medical problems. To prevent these problems, these doctors suggest letting the anger out by expressing it freely. But recently some other doctors question this. They say that people who express anger repeatedly and violently become, in fact, more but not less angry. And this could cause medical problems. However, some doctors say that both repressing and expressing anger can be dangerous. They believe that those who express anger strongly may be more likely to develop heart diseases, and that those who keep their anger inside may face a greater danger of high blood pressure. Doctors say the solution is to learn how to deal with anger. The first step is to admit that you are angry and to recognize the real cause of the anger, and then to decide if the cause is serious enough to get angry about. If it is, do not express your anger while angry. Wait until your anger has cooled down, and express yourself calmly and reasonably. Doctors also say that a good way to deal with anger is to find humor in the situation that has made you angry, for laughter is much healthier than anger.According to the passage, which of the following about hormones is correct?
①
Hormones will cause people to get anxious.
②
Hormones will increase when one gets angry.
③
The brain produces hormones when one’s blood pressure rises.
④
The brain produces hormones when one has medical problems.
【单选题】
It is no good ___________ to know what you dont know.
①
pretend
②
to pretend
③
pretending
④
pretends