A:向氯化铁溶液中加入铜粉 Fe3++Cu===Fe2++Cu2+
B:硫酸铝溶液中滴入氨水 Al3++OH— =Al(OH)3↓
C:FeBr2溶液中滴加少量氯水 2Fe2++Cl2===2Fe3++2Cl—
D:将过量CO2通入偏铝酸钠溶液中 2AlO2-+CO2+3H2O=2Al(OH)3↓+CO32—
下列关于黄土高原退耕的讨论,不正确的是( )
A:I called you yesterday. You didn't answer it. B:Oh, sorry. I_ in the bathroom at that time.