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在圆锥中，从顶点到底圆的任意一条生成线长为 $l$，底面半径 $r = 6$， - AMAZONAWS
在圆锥中，从顶点到底圆的任意一条生成线长为 $l$，底面半径 $r = 6$， - AMAZONAWS
📅 March 6, 2026
👤 scraface
Mar 06, 2026
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