∵球与圆台的两个底面和侧面均相切∴l＝r＋r＝1＋3＝4r02＝1×3＝3为什么？ 知乎 Sketch Coloring Page

∵球与圆台的两个底面和侧面均相切∴l＝r＋r＝1＋3＝4r02＝1×3＝3为什么？ 知乎 Template

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tomski∵球与圆台的两个底面和侧面均相切∴l＝r＋r＝1＋3＝4r02＝1×3＝3为什么？ 知乎 coloring

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