A:酸性:H2SO4>HClO4>HBrO4
B:碱性:NaOH>KOH>RbOH
C:非金属性: P>S>Cl
D:气态氢化物稳定性:HF>HCl>H2S
—Yes. My grandfather was one of them. He went there in his .
“华山自古一条道”是说( )。
下列有关文学常识的表述错误的一项是( )
如图所示,在平行四边形ABCD中,AE:EB=1:2,若S△AEF=6cm2,则S△ADF为( )