A.粗片狀石墨 B.細(xì)片狀石墨 C.團(tuán)絮狀石墨 D.球粒狀石墨
A.鋼 B.低碳鋼 C.中碳鋼 D.高碳鋼
A.KTZ700-02 B.HT300 C.KTH300-06 D.KTB450-07