计算机二级（选择题）

 

 

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前序中序后序遍历：

 https://blog.csdn.net/weixin_38442390/article/details/113756957

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 https://blog.csdn.net/qq_44668555/article/details/105216360?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522166048177716781685317113%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=166048177716781685317113&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~top_positive~default-1-105216360-null-null.142^v40^control,185^v2^control&utm_term=%E5%85%B3%E7%B3%BB%E6%A8%A1%E5%BC%8F&spm=1018.2226.3001.4187

 

 

https://blog.csdn.net/m0_63949551/article/details/121570670?spm=1001.2101.3001.6661.1&utm_medium=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-121570670-blog-105216360.pc_relevant_aa&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-2%7Edefault%7ECTRLIST%7ERate-1-121570670-blog-105216360.pc_relevant_aa&utm_relevant_index=1

 

三种关系模式：

 

https://blog.csdn.net/WHEgqing/article/details/108997240?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522166048275116781683988433%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=166048275116781683988433&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~top_positive~default-1-108997240-null-null.142^v40^control,185^v2^control&utm_term=BCNF&spm=1018.2226.3001.4187#t1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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