A:c<b<a
B:c<a<b
C:a<b<c
D:a<c<b
Cholera was a ____(致命的) disease. Many people died of it in the past .
如图所示,物体从O点由静止开始做匀加速直线运动,途经A,B,C三点,其中|AB|=2m,|BC|=3m.若物体通过AB和BC这两段位移的时间相等,则O,A两点之间的距离等于( )