A. I didn't know it was a counterfeit patented product, and I bought it wholesale. I didn't know the truth until afterwards, so I sold it to avoid losses.
B the same product has been produced before the filing date, and it is planned to expand the production scale without the permission of the patentee.
(3) Importing products directly obtained by the patented method from abroad without the permission of the patentee.
D. Use the patentee's patented method to conduct scientific experiments, and independently apply for a patent with the obtained results.
Correct answer: D.