Technical innovation is a complete process from the creation of a new product or process to the market application, and it includes a series of activities such as the creation of new ideas, research, development, commercial production, and promotion. The production of new ideas to research and development activities is technology The process of intellectual property creation; commercial production to promotion is the process of promoting the brand intellectual property. According to the above definition, which of the following is a technological innovation? ['In the 1990s, a hearing aid company in Denmark introduced a new organizational model: there is no formal hierarchy and reporting relationship, resource allocation is around the project team, and the organization is completely open. This innovation has achieved great success.', 'Iron and steel company has built an ultra-thin tropical production line through the introduction of international advanced technology.', 'After research and practice, a certain agricultural scientist in China-proposed a new technique for grafting fruit trees, achieving the goal of doubling the yield.', 'Technical personnel have introduced and absorbed foreign advanced technologies, designed and produced high-speed EMUs with independent intellectual property rights, and have been applied to Beijing-Tianjin, Wuhan-Guangzhou, and other lines.']