A、HCl与CuSO<sub>4sub> B、HCl与CdCl<sub>2sub> C、CuCl<sub>2sub>与CuSO<sub>4sub> D、H<sub>2sub>SO<sub>4sub>与CdCl<sub>2sub>
A、HCl与CuSO<sub>4sub> B、HCl与CdCl<sub>2sub> C、CuCl<sub>2sub>与CuSO<sub>4sub> D、H<sub>2sub>SO<sub>4sub>与CdCl<sub>2sub>
A、FeCl<sub>3sub>、BaCl<sub>2sub> B、CuSO<sub>4sub>、Na<sub>2sub>SO<sub>4sub> C、CuSO<sub>4sub>、BaCl<sub>2sub> D、FeCl<sub>3sub>、CuSO<sub>4sub>
A、CuSO<sub>4sub> B、K<sub>2sub>SO<sub>4sub> C、Al<sub>2sub>(SO<sub>4sub>)3 D、KAl(SO<sub>4sub>)<sub>2sub>
A、Fe<sub>2sub>(SO<sub>4sub>)<sub>3sub> B、CuSO<sub>4sub> C、Na<sub>2sub>SO<sub>4sub> D、Na<sub>2sub>S
A、2%的NaHCO<sub>3sub>溶液 B、0.5%CH<sub>2sub>COOH溶液 C、0.1%的CuSO<sub>4sub>溶液 D、0.1%Na<sub>2sub>SO<sub>4sub>溶液
A、Na<sub>2sub>SO<sub>4sub>、BaCl<sub>2sub>、NaOH B、Na<sub>2sub>SO<sub>4sub>、CuCl<sub>2sub>、HNO<sub>3sub> C、Na<sub>2sub>SO<sub>4sub>、CuCl<sub>2sub>、NaOH D、Na<sub>2sub>CO<sub>3sub>、CuSO<sub4sub>、H<sub>2sub>SO<sub>4sub>sub4sub>