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
하중도가 높으면 구조물의 안전성이 증가합니다.hajungdo-ga nopeumyeon gujo-mul-ui anjeonseong-i jeungga-hamnida.If the load factor is high, the safety of the structure increases.