I live near the school,so I go to school on foot.Tom is far away from the school,so he goes to school by car.Lucy often goes to school by bus.She likes taking the school bus.Lily goes to school by bike.She likes riding her
小华自己动手做了一个铁皮圆柱形笔筒,它的底面直径为6cm,高为10cm,则其表面积为( )
影响下图国家人口迁移的主要原因是( )
唐朝时,被誉为“诗仙”的伟大诗人是( )
已知⊙O1和⊙O2的半径分别是4和5,且O1O2=8,则这两个圆的位置关系是( )