题目

He found another evidence, of great importance to the case. A . which I think is B . which I think it is C . which I think it D . I think which is 答案：A 除去下列物质中的少量杂质(括号内为杂质)所用除去杂质的方法正确的是 [     ] 待提纯的物质 除去杂质的方法 A. KCl(MnO2) 加水溶解、过滤、洗涤、干燥 B. FeSO4溶液(CuSO4) 加入适量的锌粉，过滤 C. NaCl溶液(FeCl3) 加入过量NaOH溶液．过滤 D. O2(H2O) 将混合气体通过盛有足量浓硫酸的洗气瓶