如图，三棱锥的所有顶点都在一个球面上，在△ABC中，AB= 3 ，∠ACB=60°，∠BCD=90°，AB⊥CD，CD= 22 ，则该球的体积为_1．

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如图，三棱锥的所有顶点都在一个球面上，在△ABC中，AB= 3 ，∠ACB=60°，∠BCD=90°，AB⊥CD，CD= 22 ，则该球的体积为____．

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43π

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C

There are many festivals at our school. This month is October. In October there is a sports festival. We have the volleyball game and the basketball game during(在……期间) the festival. On October 15th，there is an English festival. On that day we have an English speech contest(演讲比赛)．On October 19th，we have a school trip. We go to Beijing with the teachers. On the last day of this month，there is a music festival. On that day we can enjoy beautiful music. It's really wonderful. Next month，there is an art festival. Students often display(展示) their pictures on that day.

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