Article 25 of the Patent Law stipulates that no patent right shall be granted to the following items: ① scientific discovery; ② Rules and methods of intellectual activities; ③ Diagnosis and treatment of diseases; ④ Animal and plant varieties; ⑤ substances obtained by nuclear transformation; ⑥ It is mainly used to mark the pattern, color or the combination of the two in plane printed matter. The production method of the products listed in item 4 of the preceding paragraph may be granted a patent right in accordance with the provisions of this law. According to the above provisions, items 3 and 6 of 1 are sum and AD are two errors. According to the patent law, item B is correct. According to Article 42 of the Patent Law, the term of the invention patent right is 20 years, and the term of the utility model patent right and the design patent right is 10 years, all of which are counted from the date of filing. Therefore, item C is wrong.