链表的维护与文件形式的保存：以有序链表结构表示某家电商场的库存模型。提/进货时，需对链表进行维护。每个工作日结束后，应将该链表以文件形式保存；每日营业前，应从文件中恢复该有序链表结构。-chain maintenance and preservation of the document : an orderly list structure that some home appliance stores in the inventory model. Reference/wholesale, the need for maintaining the linked list. After the end of each working day, the chain should be kept in documentary form; Daily business, documents from the orderly restoration of the list structure.