grey cast iron短语¹⁰⁶¹⁰⁰⁺⁵ 基本例句 灰口铸铁 When traces of metal magnesium or cerium are added to ordinary grey cast iron, the graphite flakes become redistributed throughout the mass of the metal as fine spheroids of graphite. 当把微量的镁或铈加到普通灰铸铁中时，片状石墨就以细小的石墨球的形式在金属母体中重新分布。 choicebest