Research on the impact of knowledge characteristics on patent quality 并列题名:Research on the impact of knowledge characteristics on patent quality Research on the effection of knowledge capital on enterprises' radical innovation capability Research on the impact of China's outward foreign direct investment on export product quality Research on the impact of human capital on China's economic growth quality research on the development strategies based on patent roadmap research on the impact of e-hailing on the travel industry Research on the impact of corporate risk-taking on social responsibility