“研究平抛物体的运动”实验的装置如图所示,在实验前应( ) A. 将斜槽的末端切线调成水平 B. 将木板校准到竖直方向,并使木板平面与小球下落的竖直平面平行 C. 在白纸上记录斜槽末端槽口的位置O,作为小球做平抛运动的起点和所建坐标系的原点 D. 小球每次必须从斜面上的同一位置由静止开始释放 _____ makes that teacher famous
is _____ over 92% of his students have been admitted to the state universities.
A. What;
because B. That; because C.
That; what D. What; that