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按钮也称为按键,是一种电闸(switch,或称开关),用来控制机械程序的某些功能。一般而言,红色按钮是用来使某一功能停止,而绿色按钮,则通常可开始某一项功能。按钮的形状通常是圆形或方形。

计算器上的电子式按钮。
机械式按钮

参见

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