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[问与答] 为什么电梯按钮 0、4、6、8、9 这些数字不是闭合的？

发表于
我发现电梯或是门禁上的这些数字的“o”型部分，都是拼凑成的，而不是闭合的。

我想了解下这背后的原因，我进行了一些搜索，但没有找到相关的解释，要是大家知道背后的 h 原因，麻烦解答下。谢谢。

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