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關注：1
2013-05-23 12:21
求翻譯：6. The structure of a class and its subclasses is called the ( class ). The levels of this hierarchy are called (layers ) or levels of abstraction.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
6. The structure of a class and its subclasses is called the ( class ). The levels of this hierarchy are called (layers ) or levels of abstraction.
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