A:①②
B:②④
C:①③
D:③④
— _____
— It's an apartment building.
①Cl2+H2O ②Na+H2O ③NO2+H2O ④Na2O2+H2O
“黄金有价、玉无价”,某一种玉石的主要成份是NaAlSi2O6,下列说法正确的是( )