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
이 발전소는 과열장치를 사용하여 효율성을 높입니다.I baljeonso-neun gwahyeoljangchi-reul sayonghayeo hyoyulseong-eul nopimnida.This power plant uses a superheater to increase efficiency.