Since the implementation of the "Twelfth Five-Year" National Economic Plan, under the background that issues such as energy shortages and air quality have gradually become the focus of human attention on a global scale,
Since the implementation of the 12th Five-Year Plan, energy shortage, air quality and other issues have gradually become the focus of human attention in the global context,
Since the implementation of the 12th Five Year Plan for national economy, under the background that energy shortage, air quality and other issues have gradually become the focus of human attention in the world,<br>