chromiumn.铬
chromium sediment铬渣
chromium compound铬化合物
chromium alloying铬合金化
chromium sulphate硫酸铬
chromium addition铝添加合金
chromium resource铬矿资源形势
chromium nitrides氮化铬
chromium reaction铬反应
chromium minerals铬矿
chromium chlorate氯酸铬