This website is based on the design principle of accessibility and uses keyboard shortcuts to strengthen the browsing convenience Layout is divided in 3 areas：
- the main menu zone at the top
- the content zone at the center
- the related information zone at the bottom
The following keys are set as the Access keys ( or speed keys) of this website.：
- Alt+U (IE), Alt+Shift+U (Firefox)：Upper block, containing the links to the services of this site, search box, font size setting and versions of this site.
- Alt+C (IE), Alt+Shift+C (Firefox)：Main content area shows the content of each page.
- Alt+B (IE), Alt+Shift+B (Firefox)：Bottom Link area.