UML类图:https://www.cnblogs.com/shindo/p/5579191.html
UML用例图:https://www.jianshu.com/p/3cde67aed8e9
UML序列图:https://www.jianshu.com/p/2e88f6c49c2e
UML状态图:https://www.jianshu.com/p/a8a3fa16a6a0
ER图:https://blog.csdn.net/belen_xue/article/details/52763629
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