Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
전기 지서는 전력을 분배하는 중요한 시설입니다.jeongi jiseoneun jeonryeogeul bunbae haneun jungyohan siselimnida.The electrical substation is an important facility for distributing power.