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【单选题】
对物质组成结构的认识错误的是 [     ]
A.
构成物质的粒子之间一定存在间隙
B.
酸碱的组成中，一定含有氢氧元素
C.
原子中质子数一定等于核外电子数
D.
化学变化中分子可以再分而原子不可分
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