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
분광학은 물질의 성질을 분석하는 데 사용됩니다.bungwanghak-eun muljil-ui seongjil-eul bunseoghan-eun de sayongdoemnida.Spectroscopy is used to analyze the properties of substances.