A、CaCO<sub>3sub> B、BaSO<sub>4sub> C、AgCl D、BaCO<sub>3sub>
A、NaOH B、浓NH<sub>3sub>·H<sub>2sub>O C、NH<sub>4sub>Cl+NH<sub>3sub> D、稀NH<sub>3sub>·H<sub>2sub>O
A、CH<sub>3sub>NH<sub>2sub> B、CH<sub>3sub>CH<sub>2sub>NHCH<sub>3sub> C、CH<sub>3sub>CH<sub>2sub>NH<sub>2sub> D、(CH<sub>3sub>CH<sub>2sub>)<sub>3sub>N
A、H<sub>2sub>C<sub>2sub>O<sub>4sub> B、CO(NH)<sub>2sub>+H<sub>2sub>C<sub>2sub>O<sub>4sub> C、H<sub>2sub>SO<sub>4sub> D、H<sub>3sub>PO<sub>4sub>
A、Fe<sub>2sub>O<sub>3sub>·nH<sub>2sub>O B、Al(OH)<sub>3sub> C、Fe(OH)<sub>3sub> D、BaSO<sub>4sub>