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About the Web Accessibility design of this Website
(1) Upper block; (2) Center block; (3) Left block; (4) Lower block
Alt+U：Main menu area, this section contains a link to the site's main menu.
Alt+L：Left block, containing the links to the major sections of this site.
Alt+C：Center block, providing the principal information of the page.
Alt+B：Information area of ​​this website.

If your browser is Firefox, the shortcut key is Shift+Alt+(the shortcut key letter), for example, Shift+Alt+C will jump to the main content display block of the webpage, and so on.