2020.4.8 fifth operation

1. Self-study notes

Learning range: 11.1 and 11.2

 2. Related procedures

 

 

 

 

 

 

 

 Three, there are problems

 Question: Why are the positions of red and yellow exactly the opposite of the book?

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Origin www.cnblogs.com/qipaopao001120/p/12689120.html