圆环体积、表面积在线计算器
圆环体积公式: V = π2 * (R + r) * (R - r)2 圆环形面积公式: S = π2 * (R2 - r2) 这里 R:外半径 r:内半径 |
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Your Guide to Legal Angling Across America - US Fishing Licenses
Your Guide to Legal Angling Across America - US Fishing Licenses