括号内是区别下列各组物质常用的试剂或方法,其中正确的是(   

括号内是区别下列各组物质常用的试剂或方法,其中正确的是(            

 A.白醋与白酒 (观察颜色)         B.水与双氧水(取样,加少量二氧化锰)

 C.空气与氮气(闻气味)            D.食盐与蔗糖(加水溶解)

答案

B

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