ssd7 实验五答案，建立ER模型，并进行描述，包含ER截图和描述文件。-ssd7 experiment five answers to the establishment of the ER model descr iption contains ER screenshots and descr iption file.

软件工程SSD7数据库exercise答案，仅供参考-The software engineering SSD7 Database exercise answers for reference only

卡耐基梅隆大学SSD7所有答案，自己做的，欢迎下载-Carnegie Mellon University SSD7 all the answers, do it yourself, welcome to download! !