圆柱体从斜坡�下滚动(无�擦力,斜坡固定)问它到达底部的速度是多�? 知乎 Template




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tomski圆柱体从斜坡�下滚动(无�擦力,斜坡固定)问它到达底部的速度是多�? 知乎 coloring