(09年崇文区期末理)一个正方体的各顶点均在同一球的球面上,若

09年崇文区期末理)一个正方体的各顶点均在同一球的球面上,若该球的体积为,则此正方体的体对角线为         ;若此正方体的一条棱长变更为3,则该棱的两端点之间的球面距离为__________

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