检修前，应吊出镜板使镜面朝上放于持平的专用机架上
参考答案：对
物体以初速度v0沿斜面上滑，运动的速度-时间图象如图所示，其中可能的是（ ）
A．
B．
C．
D．
— Hey, look where you are going?
— Oh, I'm terribly sorry, _____. [ ]
A. I'm not noticing
B. I wasn't noticing
C. I haven't noticed
D. I don't notice
