— In the present, most of us have no enough money to afford the houses.
— Yes, they are too expensive in Shenzhen.
A:Now
B:Before
C:Soon
小阳在超市购物,用8N的力水平推着一个购物车匀速直线运动,突然小阳发现前面有台阶,他马上用17N的水平力向后拉小车,使小车减速运动,在此过程中有关小车受力的说法正确的是( )