下列叙述中，正确的是[ ] A．电解精炼铜时，当转移NA个电子

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问题选择题

下列叙述中，正确的是[ ]

A．电解精炼铜时，当转移N_A个电子时，阳极材料质量减轻了32g

B．凡单原子形成的离子，一定具有稀有气体元素原子的核外电子排布

C．晶体中只要有阳离子就会有阴离子

D．18g冰中比18g水中的氢键多

答案

答案：D

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判断题

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