<img src=https://huaweicloudobs.ahjxjy.cn/5B436E50213CA227824DE252E50BBB91.png title=3-B.png alt=3-B.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/13A5D6BD048A826443FC2477D91DF073.png title=3-1.png alt=3-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/E56A0BABA57636BDA31BF105189D1E11.png title=3-2.png alt=3-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/710EE0A90FED07D9BB501CD5F47F6111.png title=3-3.png alt=3-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/FBD561EBF9DDC7DECD45CBAE10E17FAE.png title=3-4.png alt=3-4.png/>