This website is based on the design principle of accessibility and uses keyboard shortcuts to strengthen the browsing convenience Layout is divided in 4 areas：
1. the main menu zone at the top、2. the menu zone on the left side、3. the content zone at the center、4. the related information zone at the bottom The following keys are set as the Access keys ( or speed keys) of this website.：
Alt+U：Top navigation link area, this block lists the main link of this site.
Alt+L：Links on the Left area.
Alt+C：Main content area shows the content of each page.
Alt+F：Bottom Link area.