A:what; that
B:what; what
C:that; hat
D:that; what
如果△ABC∽△DEF,且对应高之比为2:3,那么△ABC和△DEF的面积之比是____.
如图所示,两个相同的盛满水的甲、乙容器放在水平桌面上,甲容器中漂浮一物块,物块密度ρ物=0.9ρ水,下列说法错误的是( )