— Can you see any ____(mouse)in the room?
— No, there aren't any.
如图1,为《探究加速度与外力间的关系》的实验装置(图中A为小车,B为带滑轮的长木板,C为水平桌面)
15÷5=____ 14÷7=____ 16÷4=____
30÷6=____ 9×5=____