历史记录

upu

1、

The paper discussed orientation workspace of 3 UPU parallel manipulators with pure spherical motion and symmetric geometry.

详细讨论了纯转动型3-UPU并联机构的工作空间.

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2、

The establishing of UPU plays an active role in promoting the postal communication among countries.

摘要万国邮联的成立对促进各国间的邮政通讯联系起了积极作用.

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