A. If the patentee accidentally loses the patent certificate, he may request China National Intellectual Property Administration to reissue it.
B patent certificates should be made and issued according to the number of applicants.
If the patent certificate is damaged, the patentee may request the replacement of the patent certificate.
If the patentee changes due to the transfer of the patent right, the changed patentee may request China National Intellectual Property Administration to issue a patent certificate.
Correct answer: C.