A、MgO>CaF<sub>2sub>>TiO<sub>2sub> B、CaF<sub>2sub>>MgO>TiO<sub>2sub> C、CaF<sub>2sub>>TiO<sub>2sub>>MgO D、TiO<sub>2sub>>CaF<sub>2sub>>MgO
A、MgO>CaF<sub>2sub>>TiO<sub>2sub> B、CaF<sub>2sub>>MgO>TiO<sub>2sub> C、CaF<sub>2sub>>TiO<sub>2sub>>MgO D、TiO<sub>2sub>>CaF<sub>2sub>>MgO
A、V<sub>2sub>O<sub>3sub>、TiO<sub>5sub> B、V<sub>2sub>O<sub>5sub>、TiO<sub>2sub> C、AgO D、P<sub>2sub>O<sub>5sub>、TiO<sub>2sub>
A、FeSO<sub>4sub>/Al<sub>2sub>O<sub>3sub>催化剂 B、TiO<sub>2sub>克劳斯反应催化剂 C、Al<sub>2sub>O<sub>3sub>催化剂