—________
A:Me, too.
B:Thank you.
C:I am happy.
树上的苹果,受到向上的拉力和向下的引力,这两个力的施力物体分别是 ____
和____。
如图所示,用大小为8.0N的水平拉力F,使物体由静止开始沿光滑水平面做匀加速直线运动,在2.0s内通过的位移为8.0m,在此过程中,求:
There are five people here. __________ there are only four cups.