知识贝壳
知识贝壳
所属栏目：英汉双解化学
A silvery white ductile transi-tion metal occurring in platinum ores inCanada and as the native metal in Brazil.Most palladium is obtained as a by-prod-uct in the extraction of copper and zinc. Itis used in electrical relays and as a catalystin hydrogenat ......（本文共 505 字 ） [阅读本文] >>