試計(jì)算下列玻璃的結(jié)構(gòu)參數(shù)及非橋氧分?jǐn)?shù)。 (1)Na2O·SiO2; (2)Na2O·CaO·Al2O3·SiO2; (3)Na2O·1/3Al2O3·SiO2; (4)18Na2O·10CaO·72SiO2 (wt%)