Technological innovation is a complete process from the generation of new products or processes to market application. It includes a series of activities from the generation of new ideas, research, development, commercial production to promotion; From commercial production to promotion, it is the process of promoting the creation of brand intellectual property rights.
According to the above definition, which of the followings belongs to technological innovation?
After research and practice, an agricultural scientist in China put forward a new technology of fruit tree grafting, and achieved the goal of quadrupling the yield