描述法表示集合时，集合的元素到底是什么？那些看着相似的集合的区别与联系在哪儿呢？
孟宝兴
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- Resource Type
-
Activity
- Tags
-
集合
- Target Group (Age)
- 10 – 19+
- Language
- Chinese Simplified / 简体中文
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