A:中国
B:蒙古
C:日本
D:菲律宾
如图所示,在匀速转动的水平圆盘上离转轴某一距离处放一小木块,该木块恰能跟随圆盘做匀速圆周运动而不发生相对滑动,则在改变下列哪种条件时,物体仍能与圆盘保持相对静止( )
①Mum hello family a thin girl your mother Mr Wang
②Is he a fat teacher? No,he isn't. He's a thin teacher.
My dad is going to Cuba _____________. He will stay there for a week.
扩句
①这位老师在读国语。
②老师在黑板上写字。