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This website is based on the design principle of accessibility and uses keyboard shortcuts to strengthen the browsing convenience Layout is divided in 2 areas:
1. the main menu zone at the top、2. the content zone at the center.

The following keys are set as the Access keys ( or speed keys) of this website:

Alt+U:
Upper block, containing the links to the services of this site.
Alt+C:
Main content area shows the content of each page.

If your browser is Firefox, Press Shift + Alt + Key to jump. For example, press "Shift + Alt + C" to jump to the center of the page.