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
붕화물은 금속과 결합하여 새로운 화합물을 형성합니다.bunghwamul-eun geumsokgwa gyeolhabhayeo saeroun hwahampul-eul hyeongseonghamnida.Borides combine with metals to form new compounds.