A.時(shí)效強(qiáng)化B.固溶強(qiáng)化C.變質(zhì)處理D.細(xì)晶強(qiáng)化
A.4.5~5.5% B.5.5~6.5% C.6.5~7.5% D.7.5~8.5%
A.銅 B.鎂 C.鋅 D.鋁