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
황화물은 금속과 결합하여 다양한 화합물을 형성할 수 있습니다.hwanghwa-mul-eun geumsokgwa gyeolhabha-yeo dayanghan hwahampul-eul hyeongseonghal su itsseumnida.Sulfides can combine with metals to form various compounds.