下列物质属于纯净物的是请选择ABCD7t2S8B+d6g)I*\:Z*z6b)L'D:A;f7u*P1^
A.新鲜空气)I*\:Z*z6b)L'D:A;f7u*P1^
B.矿泉水)I*\:Z*z6b)L'D:A;f7u*P1^
C.冰水共存物)I*\:Z*z6b)L'D:A;f7u*P1^
D.优质燃煤)I*\:Z*z6b)L'D:A;f7u*P1^