下图为我国某地区略图,图中山脉为秦岭。完成下列问题。
一个四面体ABCD的所有棱长都为2,四个顶点在同一球面上,则此球的表面积为( )
(按从左到右的顺序填写)
at the same school a difficult match from Room 205
i have a good friend called brett how about you