公共课考研英语英语1993年全国硕士研究生入学统一考试英语试题
题目内容

Which of the following is TRUE according to the passage、

2024-07-12

A.When a patent becomes out of effect, it can be re-patented or extended if necessary.

B.It is necessary for an inventor to apply for a patent before he makes his invention publi

C.C.A patent holder must publicize the details of his invention when its legal period is over.

D.One can get all the details of a patented invention from a library attached to the patent offic

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