请问一下，
Dim WithEvents T_PULS As New Timer 这是定义一个变量’ T_PULS为什么前面要加WithEvents Dim WithEvents T_PULS As New Timer
Dim WithEvents T_PULS As New Timer 这是定义一个变量’ T_PULS为什么前面要加WithEvents Dim WithEvents T_PULS As New Timer
阅读背景：
Dim WithEvents T_PULS As New Timer
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