bourgeoisbear
2020-05-10T06:00:44+00:00
[img]https://img.nga.178.com/attachments/mon_202005/10/-7Q5-3s18KbToS5z-2u.jpg.medium.jpg[/img]
[img]https://img.nga.178.com/attachments/mon_202005/10/-7Q5-ke63K15T1kS9s-7p.jpg.medium.jpg[/img]
求Ri的值
谢谢
[img]https://img.nga.178.com/attachments/mon_202005/10/-7Q5-ke63K15T1kS9s-7p.jpg.medium.jpg[/img]
求Ri的值
谢谢