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
냉간압연 공정은 금속의 강도를 증가시킵니다.naengganapyeon gongjeong-eun geumsok-ui gangdo-reul jeungsasiknida.The cold rolling process increases the strength of the metal.