10.已知正四面体内接于半径为r的球用一平面去截此正四面体和球其截面如图则球心到截面的距离为 A. B. C. D.——青夏教育精英家教�—— Template




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tomski10.已知正四面体内接于半径为r的球用一平面去截此正四面体和球其截面如图则球心到截面的距离为 a. b. coloring