选出合适的应答语。
A. You should go to bed early.
B. You should wear a sweater.
C. She should tell the teacher and go to see the doctor.
D. You should tell your mother.
E. You should take it to see the vet.
F. You should help her do some chores.
如图所示,一足够长的木板静止在光滑水平面上,一物块静止在木板上,木板和物块间有摩擦.现用水平力向右拉木板 ,当物块相对木板滑动了一段距离但仍有相对运动时,撤掉拉力,此后木板和物块相对于水平面的运动情况为( )
分析下列各组微粒结构示意图,与表示的意义一致的是 ()