Which line city does Yantai belong to?

There is no fixed standard for the division of second-tier cities. It can be divided by administrative level, city size and population, and can also be divided by standards such as economic development level and GDP. Second-line strong Nanjing Jinan Hangzhou (economically developed, sub-provincial) Chongqing (municipality directly under the Central Government) Wuhan Shenyang Xi An Chengdu (both belong to regional central cities) Qingdao Dalian Ningbo (three economically developed cities with separate plans) Suzhou Wuxi (the most developed two non-provincial cities) Harbin Changchun (the remaining two sub-provincial cities) Xiamen (cities with separate plans), The scale is small, so it can only be in the second line) Foshan Dongguan (two cities with strong manufacturing economy) Hefei Zhengzhou Changsha Fuzhou Shijiazhuang (five non-sub-provincial capital cities with good economic development) Urumqi Kunming (the frontier international city with national key development) The second line is weak Lanzhou Nanchang Guiyang Nanning Taiyuan Hohhot (six provincial capital cities with equal strength) Changzhou (an old developed city) Tangshan (a heavy industrial city around the Bohai Sea) Yantai (an important port around the Bohai Sea, Linyi (red fertile soil, famous logistics city) Quanzhou (southern Fujian economic center city) Baotou (heavy industry city) Xuzhou (core of Huaihai Economic Zone) Nantong (emerging economic strong city) Handan (steel and cotton textile industrial city) Wenzhou (important economic city)