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24c01_51c
- 自行车测速:主要是根据自行车行走时车轮转动的圈数,再与车轮周长相乘,得到行车路程,测出行车路程中所用的时间,即可得到车速。-bike speed:When walking was based largely on bicycle wheel rotation lap, again with wheel circumference multiplication, get the driving distance is measured in driving distance, of the amo