54km/h=54x =
问题描述:
54km/h=54x =
答
答:
54km/h=54000m/3600s=540/36m/s=15m/s54乘什么
54km/h=54x =
答:
54km/h=54000m/3600s=540/36m/s=15m/s54乘什么