1, Bureau of Retired Veteran Cadres under the Central Office; Main work contents: engaged in housing management, engineering construction and maintenance management; Education requirements: Bachelor degree only. 2. The First Historical Archives of China under the Central Archives and the National Archives; Main work contents: safety and fire fighting; Education requirements: Bachelor degree or above. 3. China's Second Historical Archives under the Central Archives and the National Archives Bureau; Main work contents: water supply and drainage, heating and ventilation in the museum area; Education requirements: Bachelor degree or above. Huangpu Maritime Bureau under Shanghai Maritime Bureau; Main work contents: grass-roots maritime law enforcement;