本系统为模拟图书馆的操作柜台，涉及到排队以及借还书两大部分。 用户的主要操作为柜台操作，即借书、还书、查询图书。 -The library system to simulate the operation of the counter, as well as by queuing involves two major books. The main operation of the user' s operation to counter that library, books,