alcaline-earth metal alkali-earth metal alkaline earth metal earth alkali metal
碱土金属;
alcaline-earth metal alkali-earth metal alkaline earth metal earth alkali metal
碱土金属;
alcaline-earth metal alkali-earth metal alkaline earth metal earth alkali metal
碱土金属;
alcaline-earth metal alkali-earth metal alkaline earth metal earth alkali metal
碱土金属;
alcaline-earth metal alkali-earth metal alkaline earth metal earth alkali metal
碱土金属;