A:H2O2 + H2SO4 ══ SO2 ↑ + O2 ↑ + 2H2O
B:I2 + SO2 + 2H2O ══ H2SO4 + 2HI
C:2Fe2+ + Cl2 ══ 2Fe3+ + 2Cl-
D:2Fe3+ + SO2 + 2H2O ══ 2Fe2+ + SO42-+ 4H+
我国省级行政区的设立源于( )
— Yes. He never praised him ________ he became one of the top students in his grade.