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URL：https://4.bp.blogspot.com/-V93sUq2tQX4/U-Ubkk1znjI/AAAAAAAAJ4w/q8gqK_OX5B4/s1600/重心と断面２次モーメント_3.GIF 掲載元：https://m-sudo.blogspot.com/2014/08/blog-post_9.html
