Mother often does the laundry on Sunday.
A:does the cleaning
B:washes clothes
C:goes shopping
D:does some reading
如图所示,光滑水平面右端B处连接一个竖直的半径为R的光滑半圆轨道,B点为水平面与轨道的切点,在离B距离为x的A点,用水平恒力将质量为m的质点从静止开始推到B处后撤去恒力,质点沿半圆轨道运动到C处后又正好落回A点.试求:
根据意思写词语
①心地仁慈,不忍下手(给以惩处、打击等)。____
②得到天然的特别优厚的待遇。指享有特殊优厚的条件。____