∵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