This website is built on the principles of accessible web design. The main content of the website is divided into three major sections:
1. Upper area, 2. Central area, 3. Lower area.

The access key of this website is set as follows:

Alt+U: The top functional area, including the main menu, site navigation, site search.
Alt+C: Central Content Block, the main content area on this page.
Alt+Z: The following function block contains relevant information of this site and other site links.