—Many people in big cities cannot enjoy life even though they have houses, cars and ideal jobs.
—Sub-health may partially ______ it.
甲、乙两物体从同一地点由静止开始向同一方向运动,它们的加速度(a)与时间(t)的关系图象如图所示.在0~t0时间内,下列关于两物体运动的说法中,不正确的是( )