下列区分两种不同物质的方法不合理的是   A.用闻气味的方法区分

下列区分两种不同物质的方法不合理的是

  A.用闻气味的方法区分白酒和白醋       B.用水区分CuO粉末与MnO2粉末

C.用观察颜色的方法区分铜片和铁片     D.用加热的方法区分碳酸氢铵固体与蔗糖固体

答案

B

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