Four. According to the regulations of the Education and Training Center of China Construction Association, it is usually necessary to stamp when issuing certificates. It needs to be stamped with the seal, appraisal seal and supervision seal of China Construction Association Education and Training Center, so the certificate issued by China Construction Association Education and Training Center is stamped with four seals. The Education and Training Center of China Construction Association is a non-enterprise social service organization funded by China Construction Association and registered with the approval of Haidian District Education Committee.