如下图所示的四种测量器具中,不能直接测量物体质量的器具是( )
A:托盘天平
B: 电子天平
C:弹簧测力计
D:案秤
Our geography teacher told us the sun _______ in the east and sets in the west.
The floor is very dirty. Will you please ______?
在抵抗元朝统一过程中的英雄人物是( )