A:kangaroo
B:inside
C:map
— Ann is in hospital.
— Oh, really? I ________ know. I ________ go and visit her.
化学实验里,老师给学生准备了如图几种实验装置.
如图(甲)所示,水平传送带以恒定速率运行,某时刻(t=0)小物块从与传送带等高的光滑平台A处滑上传送带,小物块运动的v﹣t图象(以地面为参考系)如图(乙),g取10m/s2,则( )