Compared with traditional industries, what are the main characteristics of high-tech industries? (Get full marks for answering two questions correctly.

High-tech industry is an industry with electronic information industry as the "leader", with high technology content and rapid product upgrading. Among the employees in high-tech industrial zones, scientific and technological personnel account for a large proportion; Most high-tech industrial zones in China are attached to big cities; The distribution of high-tech industries in China is characterized by large dispersion and small concentration; A large part of the sales revenue is spent on research and development.

So the answer is: products are updated quickly, and scientific and technological personnel account for a large proportion of employees in high-tech industrial zones. The distribution of high-tech industries in China is characterized by large dispersion and small concentration, and a large proportion of sales revenue is spent on research and development.