如何判断候选关键字
![图片.png](data/attachment/forum/202309/07/001405o1lgj4yozcu5mec5.png)将每个字母拿出来单独标一个点,依赖于哪个就画箭头,得到关系图
![图片.png](data/attachment/forum/202309/07/001433j1pbbnt4ab1tombp.png)
证明CD是单向,选A
![图片.png](data/attachment/forum/202309/07/002206mirz4zbhyiburxr7.png)
继续画图
可以看出选CE
![图片.png](data/attachment/forum/202309/07/002321t3tm6dfz0dmxxxfc.png) 参考资料https://blog.csdn.net/sword_happy/article/details/108999161
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