多项选择题
A.90% B.95% C.98% D.99%
A.含铅90%、含铜0.05%、含铋0.05% B.含铅99%、含铜0.05%、含铋0.05% C.含铅99.9%、含铜0.05%、含铋0.05% D.含铅99.99%、含铜0.01%
A.含铁0.5%、含铜0.3%、含硅0.4%的铝 B.含铁0.6%、含铜0.1%、含硅0.4%的铝 C.含铁0.5%、含铜0.2%、含硅0.5%的铝 D.含铁0.7%、含铜0.1%、含硅0.4%的铝