A:铁丝燃烧
B:铁器生锈
C:铁杵磨成针
D:铁矿石炼铁
I don't really stand Beijing Opera, but _________ of my parents like it a lot.
如图,一个底面圆周长为24m,高为5m的圆柱体,一只蚂蚁沿侧表面从点A到点B所经过的最短路线长为( )