反应开始时：c（KMnO4）= 0.001mol/L×0.004L 0.004L+0.002L =0.00067 mol?L-1反应时间：△t= 6min+7min+7min 3 =6.7min KMnO4的平均反应速率：ν（KMnO4）= △c △t = 0.00067mol/L 6.7min =1×10-4 mol?L-1?min-1故选A．
