You need to bring a health code to Qingdao North Library. Health codes can be replaced by static codes. According to relevant information, static codes are very important for the elderly, teenagers and children who don't have smart phones. These people just need to apply for static code, save it, print it and take it with them. When entering or leaving a public place, the place administrator and the bayonet inspector will show the static code, and then use the mobile phone one code pass applet (directly below the homepage of the applet or the workbench to scan the code for registration) or other automatic devices (such as gates) to scan the citizen static code in reverse, so as to complete the audit operation for people entering or leaving the place.