1.三棱锥的三个侧面两两互相垂直,且侧棱长为2倍根号3,则该三棱锥外接球的体积为( )A 48派 B 36 C 32 D 122.空间四边形ABCD,P,R分别是AB,CD的中点,PR=3,AC=4,BD=2倍根号5,则AC与BD所成角的度数为?3
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![1.三棱锥的三个侧面两两互相垂直,且侧棱长为2倍根号3,则该三棱锥外接球的体积为( )A 48派 B 36 C 32 D 122.空间四边形ABCD,P,R分别是AB,CD的中点,PR=3,AC=4,BD=2倍根号5,则AC与BD所成角的度数为?3](/uploads/image/z/11541614-14-4.jpg?t=1.%E4%B8%89%E6%A3%B1%E9%94%A5%E7%9A%84%E4%B8%89%E4%B8%AA%E4%BE%A7%E9%9D%A2%E4%B8%A4%E4%B8%A4%E4%BA%92%E7%9B%B8%E5%9E%82%E7%9B%B4%2C%E4%B8%94%E4%BE%A7%E6%A3%B1%E9%95%BF%E4%B8%BA2%E5%80%8D%E6%A0%B9%E5%8F%B73%2C%E5%88%99%E8%AF%A5%E4%B8%89%E6%A3%B1%E9%94%A5%E5%A4%96%E6%8E%A5%E7%90%83%E7%9A%84%E4%BD%93%E7%A7%AF%E4%B8%BA%EF%BC%88+%EF%BC%89A+48%E6%B4%BE+B+36+C+32+D+122.%E7%A9%BA%E9%97%B4%E5%9B%9B%E8%BE%B9%E5%BD%A2ABCD%2CP%2CR%E5%88%86%E5%88%AB%E6%98%AFAB%2CCD%E7%9A%84%E4%B8%AD%E7%82%B9%2CPR%EF%BC%9D3%2CAC%EF%BC%9D4%2CBD%EF%BC%9D2%E5%80%8D%E6%A0%B9%E5%8F%B75%2C%E5%88%99AC%E4%B8%8EBD%E6%89%80%E6%88%90%E8%A7%92%E7%9A%84%E5%BA%A6%E6%95%B0%E4%B8%BA%3F3)
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