How to swipe the card in the computer room on the 4 th floor of Hunan Agricultural University Library? After swiping your card for the first time, do you log off the plane after a certain period of time and deduct money at the same time? Swiping a card before going to the computer is to turn on the computer. When you get off the computer, be sure to swipe your card. Deduct money by swiping your card, and then turn it off. If you don't swipe your card, the money will be gone. So the next time you get on the plane, it will show that you haven't got off the plane. Very troublesome