- Ngoai hai nguyen lieu chinh d trenngudi ta con dimg them chat chayCaC03 hoac Si02 de ha thap nhiet donong chay va tao xi.GV chieu len man hinh bai tap sau choHS thao luan182Hogt dgng
cua GVHogt dgng
cua HSBai tap: Trong cac quang (da tach tap HS thao luanchit) sau: Fe203, Fe304, FeS2[r]