已知菱形的边长为2,将沿折起,使得点至点的位置,得到四面体当二面角的大小为120°时,四面体的体积为;当四面体的体积为1时,以为球心,的长 Template


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tomski已知菱形的边长为2,将沿折起,使得点至点的位置,得到四面体当二面角的大小为120°时,四面体的体积为;当四面体的体积为1时,以为球心,的长 coloring