1. Open the WeChat app, click "+"in the upper right corner of the homepage, then click "Add Friends" to search for "Health Jining Service Number", and then click "Medical Services" in the menu bar below. The small QR code in the upper right corner will become a large QR code, and then the screenshot will be saved to an album or gallery.
2. Click on the photo album or gallery on the desktop, find the screenshot picture to be scanned with the code scanning gun or code scanning pier, and you can make nucleic acid.