[单项选择题] 在窗体上画一个名称为Command1的命令按钮，然后编写如下事件过程： Private Sub subl(ByVal x As Integer, ByVal y As Integer

[单项选择题] 在窗体上画一个名称为Command1的命令按钮，然后编写如下事件过程：

Private Sub subl(ByVal x As Integer, ByVal y As Integer, ByVal z As Integer)

z=x*x+y*y

End Sub

Private Sub Command1_Click()

Dim a As Integer

a=8

Call subl(1, 2,

A．

&nb