①18个正方体,每____个一堆,摆了____堆。18÷ ____=____(堆)
②18个正方体摆成____堆,平均每堆____个。18÷____ = ____(个)
小明在“探究凸透镜成像规律”的实验中,记录并绘制了像到光心的距离v与物体到光心的距离u之间关系的图象,如图所示,下列判断正确的是( )
The mountain I visited last Sunday isn't very ___________. Few ___________ go sightseeing there.