题干

制动防抱死系统(antilock brake system)简称ABS,其作用就是在汽车制动时,自动控制制动器制动力的大小,使车轮不被抱死,处于边滚边滑的状态,以保证车轮与地面的附着力为最大值.某汽车在启用ABS刹车系统和不启用该刹车系统紧急刹车时,其车速与时间的变化关系分别如图中的①、②图线所示.由图可知,启用ABS后(   )

A:瞬时速度总比不启用ABS时小

B:加速度总比不启用ABS时大

C:刹车后的平均速度比不启用ABS时小

D:刹车后前行的距离比不启用ABS更短

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答案(点此获取答案解析)

D

同类题5

阅读下面短文,从短文后各题所给的A、B、C和D四个选项中,故答案选出可以填入空白处的最佳选项。

    Easter is a holiday celebrated all over the world. A lot of people like to do 1 things during the Easter weekend. One year my friends Katherine and David decided to 2 on the weekend. They lived in Houston and I lived in San Antonio, about 250km away.

    I was very 3 to go to the wedding. I 4 a new black suit, new black shoes, and a great wedding gift for Katherine and David. After having breakfast in my apartment, I was ready to go and got into my car. I started the car and was 5! The car made a very loud scratchy 6. It didn't start. My car was 7!

    I 8 called my other friends who were going to the wedding. They were all in Houston already. I was so 9. I really wanted to go to the wedding. Then I 10 one more person that might still be in San Antonio. The girl I 11, Emily.

    I called Emily to see if she was still in town and she was! She came to my 12 and we drove to the wedding together. I was a little nervous 13 I liked her very much, but I didn't dare to ask her out. On the way, we had a great14 and we were both really excited for David and Katherine and couldn't 15 to get there.

    The wedding was beautiful. There was so much delicious food at the16, and because it was Easter, the entire wedding was 17 in very bright colors. The best part was that Emily and I danced all night together. I got to know her very well and we decided to go on a 18 when we 19 to San Antonio. My car breaking down was the best thing that 20 to me that Easter weekend!