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、Mn<sub>2sub>O<sub>3sub>,Fe<sub>2sub>O<sub>3sub> B、CaO,MgO C、SiO<sub>2sub>,CaF<sub>2sub>