下列分类正确的是   A.蒸馏水和矿泉水:硬水           B.

下列分类正确的是

  A.蒸馏水和矿泉水:硬水           B.生铁和塑料:合成材料

  C.金刚行和石墨:碳单质          D.氧化钾和碳酸钾:盐类

答案

C

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