1, which is convenient for users to query or obtain digital information in their own homes, offices, dormitories and any places with networked computers without going to the library; Users don't need to go back and forth for borrowing procedures, just click in front of the computer.
2. All users can fully obtain the required information.
3. There are many quick retrieval methods, fast retrieval speed and fast transmission speed.
4. Maximize the use within the scope of copyright protection. Digital documents do not need to be copied. Many people can use the same document at the same time, so there is no problem of refusing to borrow it.