下列有关概念的辨析中正确的是

题干

下列有关概念的辨析中正确的是（）

A：分子是保持所有物质化学性质的最小微粒

B：催化剂一定能加快化学反应的速率

C：元素的种类是由原子的中子数决定的

D：由一种元素组成的物质可能是混合物

上一题下一题 0.0难度选择题更新时间:2017-11-13 03:51:37

D

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