2.将圆柱、圆锥和球分为一类的根据是( )
0 286828 286836 286842 286846 286852 286854 286858 286864 286866 286872 286878 286882 286884 286888 286894 286896 286902 286906 286908 286912 286914 286918 286920 286922 286923 286924 286926 286927 286928 286930 286932 286936 286938 286942 286944 286948 286954 286956 286962 286966 286968 286972 286978 286984 286986 286992 286996 286998 287004 287008 287014 287022 366461
| A. | 它们都是圆的 | B. | 它们都由曲面围成 | ||
| C. | 它们最多有一个顶点 | D. | 它们至少有一个曲面 |