A Study on the Effects of Diffusion or Backwash of High-Tech Industry Based on the FEDER Model of Spatial Econometrics in China, A Study on the Effects of Diffusion or Backwash of High-Tech Industry Based on the FEDER Model of Spatial Econometrics in China, A Study on the Effects of Diffusion or Backwash of High-Tech Industry Based on the FEDER Model of Spatial Econometrics in China