turn round, every time, go for a walk, make noise, in the middle of
If you ____ ____ ____ ____ get a good job, you must catch it.
一变速运动物体的运动速度vt=2t0≤t≤1at1≤t≤2bt2≤t≤e则该物体在0≤t≤e时间段内运动的路程为(速度单位:m/s,时间单位:s)____.