<img src=https://huaweicloudobs.ahjxjy.cn/FF42DEDC1CEE6EA65ED706C65C12E8F7.png title=7-A.png alt=7-A.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/4FD527473086F6D479AED5030841479A.png title=7-1.png alt=7-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/91E708370820AE4ACDFE6F5314B6166F.png title=7-2.png alt=7-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/F404A2D27FC695075CF4E6905C736E26.png title=7-3.png alt=7-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/7A31014B927AFF72572DD4C511376934.png title=7-4.png alt=7-4.png/>