In modern reinforced concrete building systems, while enjoying modern lifestyles, we also lose a lot, such as the air we breathe every day. Many people have occupational diseases, and breathing unheal...
1. In order to improve performance, modern optical lenses are coated with multiple layers of polymer materials on the surface of the lens. This layer of synthetic material provides rich nutrition for ...
The long history and culture is bright, the modern civilization of science and technology is brilliant, the passing of time and longing for the distant convergence, in a museum, you and I see the past...
