A:汽车的加速度为4m/s2
B: 汽车的加速度为8m/s2
C: 汽车的平均速度为6m/s
D: 汽车的平均速度为10m/s
Don't ____ ____ the old man. He is so poor.
Her brother is good in English in his class.
____
下面几个关于力的说法,正确的是 ( )