A:认
B:真
C:复
D:习
重组单词
① It's ____ the library.
② What a great ____!
③ ____ is the post office?
④ The shop is ____ to the door.
⑤ Today is Tuesday. We have ____.
已知长为L的光滑斜面,物体从斜面顶端由静止开始以恒定的加速度下滑,当物体的速度是到达斜面底端速度的一半时,它沿斜面下滑的位移是( )