A、CH<sub>4sub> B、C<sub>2sub>H5OH C、CH<sub>3sub>OH D、CH<sub>3sub>COOH
A、C<sub>2sub>H<sub>3sub> B、C<sub>2sub>H<sub>4sub> C、C<sub>2sub>H<sub>2sub> D、CH<sub>2sub>
A、Fe<sub>2sub>O<sub>3sub> B、Fe<sub>3sub>O<sub>4sub> C、FeCO<sub>3sub> D、2Fe<sub>2sub>O<sub>3sub>·3H<sub>2sub>O
A、MnO<sub>2sub> B、Mn<sub>3sub>O<sub>4sub> C、Mn<sub>2sub>O<sub>3sub>·H<sub>2sub>O D、3Mn<sub>2sub>O<sub>3sub>·MnSiO<sub>3sub>
A、CH<sub>2sub>=CH-COOH B、CH<sub>2sub>=CH-COOCH<sub>3sub> C、CH<sub>2sub>=CH-CN D、CH<sub>2sub>=CH-OCOCH<sub>3sub>
A、同系物在分子组成上相差n个CH<sub>2sub>原子团 B、同系物间有同分异构体 C、同系物因为分子组成不同,其化学性不同 D、CH<sub>3sub>-CH<sub>2sub>-CL和CH<sub>3sub>-CH-CH<sub>3sub>不是同系物
A、H<sub>2sub>B<sub>3sub>O<sub>6sub> B、H<sub>2sub>B<sub>4sub>O<sub>7sub> C、H<sub>2sub>B<sub>2sub>O<sub>3sub> D、H<sub>2sub>B<sub>3sub>O<sub>5sub>
A、Ca(OH)<sub>2sub>和CaCO<sub>3sub> B、CaO和CaCO<sub>3sub> C、CaO和Ca(OH)<sub>2sub> D、Ca(OH)<sub>2sub>和CaO