— Is the __________ big and clean?
— Yes, and many students like swimming in it.
A:shop
B:pool
C:house
D:supermarket
受阿基米德辨别真假皇冠故事启发,同学们设计了一个测量碗的密度的探究实验,部分实验步骤及数据如图,则空碗漂浮时受到的浮力为____ N.