发布时间:2025-01-24 13:14:53
质量=体积×密度
圆片体积
=2兀r²×0.7×10^-3m³
=2兀0.13²×0.7×10^-3
铁的密度7850kg/m³
所以,
质量=2兀0.13²×0.7×10^-3m³×7850kg/m³
=2×3.14×0.13²×0.7×10^-3×7850kg
≈0.583kg
金刚石碎片然后龙族之信仰然后流星诺然后魔剑也碎了4连爆为什么3个粉垫子都上不去一个10魔剑
2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53我想知道现在904热轧不锈钢扁钢 403冷轧不锈钢扁钢 410冷轧不锈扁钢哪里生产的质量比较可靠啊
2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53 2025-01-24 13:14:53