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常用的黑盒测试有等价分类法、______、因果图法和错误推测法4种。

【参考答案】

边值解析法

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下面程序是由鼠标事件在窗体上画图，如果按下鼠标将可以画图，双击窗体可以清除所画图形。补充完整下而的程序。首先在窗体层定义如下变量： Dim PaintStart As Boolean 编写如下事件过程： Private Sub Form_Load() DrawWidth=2 ForeColor=vbGreen End Sub Private Sub Form_MouseDown(Button As Integer，Shift As Integer,_X As Single，Y As Single) PaintStart=True End Sub Private Sub Form_MouseMove(Button As Integer，Shift As Integer,_x As Single，Y As Single) If PaintStart Then PSet(X,Y) End If End Sub Private Sub Form_MouseUp(Button As Integer，Shift As Integer,_X As Single，Y As Single) ______ End Sub Private Sub Form-DblClick() Cls End Sub

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滚动条响应的重要事件有______和Change。

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