One of the oddest things to an outsider about the United States patent system is that it is impossible for the U. S. Patent and Trademark Office (PTO) ever to finally reject a patent application.

摘 要：对一个美国专利系统的局外人来说，最奇怪的事情之一就是美国专利和商标局（PTO）不可能最终拒绝一项专利申请。

youdao

The topology and software module structure of Power Traction Operation Management Information System (PTO MIS) is proposed for its development. The application of ASP in PTO MIS is also discussed.

针对牵引供电运营MIS (PTO MIS)的设计，提出了它的网络拓扑结构和软件模块结构，同时对asp技术在牵引供电运营MIS中的应用进行了探讨。

youdao