题型:问答题 下列离子方程式中正确的是( )A.漂白粉溶液在空气中失效:ClO-+CO2+H2O═HClO+HCO3-B.用浓盐酸与MnO2反应制取少量氯气:MnO2+2H++2Cl- △ . Mn2++Cl2↑+2H2OC.将Fe2O3溶解于足量H+溶液:Fe2O3+6H+=2Fe3++3H2OD.KI溶液与H2SO4酸化的H2O2溶液混合:2I-+H2O2+2H+=2H2O+I2 查看答案
题型:问答题 It was a serious mistake, ______ caused by carelessness. A.which I think wasB.which I think it was C.I think which wasD.that I think it was 查看答案