A:酸性:H4SiO4<H3PO4<H2SO4<HClO4
B:熔沸点:HF<HCl<HBr<HI
C:还原性:SiH4>NH3>H2O>HF
D:半径:Al3+<Mg2+<Na+<F﹣
—What are you doing now, Lily?— I music.
下列各命题正确的是 : ( )