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
기체측정은 대기 중의 가스를 분석하는 데 사용됩니다.gichecheugjeongeun daegi jungui gaseureul bunseoghaneun de sayongdoemnida.Aerometry is used to analyze gases in the atmosphere.