Legal basis: Instructions for the Use of Changchun Library Reservation System 1. Please swipe in and out of the library at the main entrance of the library according to the appointment time; If the reservation system is available, library readers can swipe their cards at the main entrance to make a second reservation. ? 3. If you need to apply for a reader's card, please go to the library for 24 hours in self-service library; The admission system is open from 7: 00 to 22: 30 every day.