一质量为m的木块静止在光滑的水平面上,从t=0开始,将一个大小为F的水平恒力作用在该木块上,在t=T时刻,F的功率是( )
如图所示,甲、乙两图是小月同学探究平面镜成像特点的实验情景.
战国时期,针对当时的社会动荡,某学派认为:“若大国之攻小国也,大家之乱小家也;强之劫弱,众之暴寡,诈之谋愚,贵之敖贱,此天下之害也。”该学派应是( )
This is my room (房间).I have a new desk and a chair.The book is on the desk.The ruler is under the book.My eraser is in the pencil box.My bag is on the chair.Where's my cat? It's under the chair.It's sleeping (睡觉).