试题与答案

正、负离子相互吸引，结合到一起，正、负电荷相互中和的过程被称为（）。

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题型：填空题

题目：

正、负离子相互吸引，结合到一起，正、负电荷相互中和的过程被称为（）。

答案：

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题型：材料分析题

十九世纪英国作家查尔斯·狄更斯在《大卫·科波菲尔》中写道：年收入二十镑，年支出十九镑十九先令六便士，结局是幸福；年收入二十镑，年支出二十镑零六便士，结局是痛苦。

请运用所学消费的有关知识简要回答：

（1）狄更斯评价“幸福”和“痛苦”的依据是什么？

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（2）同样是“年收入二十镑，年支出十九镑十九先令六便士”的人，获得“幸福”的程度也可能不同，为什么？

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