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>
A、BaCl<sub>2sub>AgNO<sub>3sub> B、CuSO<sub>4sub>NaCl C、Na<sub>2sub>CO<sub>3sub>KOH D、CaCl<sub>2sub>K<sub>2sub>CO<sub>3sub>
A、Ba(OH)<sub>2sub>和CuSO<sub>4sub> B、Ca(OH)<sub>2sub>和Na<sub>2sub>CO<sub>3sub> C、AgNO<sub>3sub>和NaCl D、NaOH和Fe(NO<sub>3sub>)<sub>2sub>
A、Na<sub>2sub>S<sub>2sub>O<sub>3sub>·5H<sub>2sub>O B、Na<sub>2sub>C<sub>2sub>O<sub>4sub> C、Na<sub>2sub>SO<sub>3sub> D、NaCl