A.鉛的質(zhì)量分?jǐn)?shù)B.鐵的質(zhì)量分?jǐn)?shù)C.汞的質(zhì)量分?jǐn)?shù)D.砷的質(zhì)量分?jǐn)?shù)
A.4B.6C.7D.5
A.沉淀反應(yīng)要迅速B.滴定反應(yīng)能定量完成C.要有確定滴定反應(yīng)終點(diǎn)的方法D.沉淀要有顏色