车轮周长卜伍=2πR=πD=3.14*0.5=1.57米,神搭圈数=距离/周长=1000/型瞎或1.57=636.94≈637 圈
车轮圆世源高搜尺周裂册=2πR=πD=3.14*0.5=1.57转速R=距离/圆周=1000/1.57=636.94 圈
2000圈1000M除0.5M等于2000
1000/(0.5*3.14)=1000/1.57=636.94≈637(圈)