“变质剂”用英语怎么说

研制了一种钇基重稀土变质剂.A new type of Y base heavy rare earth modificator was developed.介绍了一种新型复合变质剂及其变质工艺.The paper introduces a new type composite modifier and modification technology.变质剂对低合金白口铸铁的组织结构具有显著的影响.The structure of low...