<img src=https://huaweicloudobs.ahjxjy.cn/653AFBC236AB5A1DB7FDDDBA6818DAF7.png title=19.png alt=19.png/>
①
<img src=https://huaweicloudobs.ahjxjy.cn/DBF1C6E509BD60C0EF7F49C0B377B993.png title=19-1.png alt=19-1.png/>
②
<img src=https://huaweicloudobs.ahjxjy.cn/A377CBD27BED86A5669C686C2626B241.png title=19-2.png alt=19-2.png/>
③
<img src=https://huaweicloudobs.ahjxjy.cn/BE18999568BB15554EBEA520B374A89C.png title=19-3.png alt=19-3.png/>
④
<img src=https://huaweicloudobs.ahjxjy.cn/1E4D7E87E6F69603BBE317B2D4226E4B.png title=19-4.png alt=19-4.png/>