发布时间:2025-02-03 00:15:37
R为半径,体积V=4/3*pi*R*R*R,表面积S=4*pi*R*R, 比表面积=S/V=3/R,减小半径就可以了。
众音指纹锁售后服务全国24小时热线2022已更新今日47推荐
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