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
야금학은 금속의 성질과 가공을 연구하는 학문입니다.yageumhak-eun geumsok-ui seongjil-gwa gagong-eul yeonguhaneun hakmun-imnida.Metallurgy is the study of the properties and processing of metals.