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                                            ZhiGang Yuan

我来提交pr修改这个问题

15.1章节中 ![image](https://user-images.githubusercontent.com/83761884/164965292-330e974b-7afd-4803-b591-148d2e6e9e7e.png)

@eedalong

![image](https://user-images.githubusercontent.com/83761884/164965929-833e658b-7af5-4e20-a68e-24c5cacb7103.png)

13.2章节![image](https://user-images.githubusercontent.com/83761884/164965960-20c0e215-2613-4dce-b8b8-3488a74323fd.png)

@eedalong

@eedalong

14.3章节 ![image](https://user-images.githubusercontent.com/83761884/164965760-d347aa99-a718-4f1c-bb60-00ec24ce7606.png)

![image](https://user-images.githubusercontent.com/83761884/164965794-ee8ee84a-6711-4dc2-bd9c-6ab39ad993da.png)

![image](https://user-images.githubusercontent.com/83761884/164965866-cb1e6882-50ea-4658-a18e-15c9122cb916.png)