“Here is a new coat for you. __________ .” My mother said.
A:Put it on
B:Put on it
C:Take off it
D:Take it off
如图所示,一个正方体A浸没在水下某一深度时,上表面受到水15N的压力,下表面受到水20N的压力,则此时A受到的浮力是( )
There are two birthdays in August. (改为一般疑问句)
____ two birthdays in August?