What is the R&D strength of China?

Science and technology in China has always been a process of accumulation. From the founding of the people's Republic of China to the beginning of the new century, it has been accumulating. Now it's a time of accumulation, and various new technologies and weapons appear one after another. Nuclear submarines, 052D frigates, Aegis ships, Liaoning aircraft carriers, Zhi 9 and so on are all achievements made by China in science and technology in recent days. It can be said that China dare not surpass the United States now, but on the whole,