下列对分子、原子、离子的认识,正确的是 A.原子是最小的粒子,

下列对分子、原子、离子的认识,正确的是

A原子是最小的粒子,不可再分              B.温度越高,分子运动速率越快

C分子是保持物质性质的一种粒子            D.镁原子与镁离子的化学性质相同

答案

B

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