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为什么电梯门口有上下两个按钮
更新时间: 2020-09-19 00:00:00  

因为电梯运行有两个方向,一个向上,一个向下。如果你按了向上的按钮没按向下的按钮,那么下行的电梯是不会在这一层停的,只有上行电梯会停,同理,按向下按钮,只有下行电梯才会停在这一层。这样设置不会让想下去的人上电梯之后非得上到顶层才能下来。

关键词: 为什么 电梯 门口 上下 按钮

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