题目内容
某品牌电动自行车的铭牌如下:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414543391722764.png)
根据该铭牌的有关数据可知该车的额定时速约为( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/2014082414543391722764.png)
根据该铭牌的有关数据可知该车的额定时速约为( )
A.15km/h | B.18km/h | C.20km/h | D.25km/h |
C
试题分析:根据电动车的额定转速,求出1h转多少圈,求出1圈的周长,即可知道电动车在1h内运行的距离,即时速.
电动车在1h内转过的圈数
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145433964815.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241454340261284.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824145434104731.png)
点评:解决本题的关键求出1h内电动车行走的路程,通过额定转速求出1h内转过的圈数,从而求出1h内行走的路程.
![](http://thumb2018.1010pic.com/images/loading.gif)
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