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Add solution for exercise 3-11
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chapter3/exercise3-11.org

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#+LATEX_CLASS: ramsay-org-article
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#+LATEX_CLASS_OPTIONS: [oneside,A4paper,12pt]
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#+AUTHOR: Ramsay Leung
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#+DATE: 2025-06-11 Wed 22:59
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[[file:../img/chapter3/exercise-3-11.png]]
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=acc= 的状态存在 =E1=, =acc2= 的状态存在 =E6= 中.
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这两个账户的局部状态是如何保持不同的?
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每次调用 =make=account= 都会创建一个新的环境框架,每个环境框架都有自己的 =balance= 绑定
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环境结构中的哪些部分被 =acc= 和 =acc2= 共享?
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定义在全局环境的 =make-account= 被共享.

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