单选题 窗体上有一个名称为Command1的命令按钮，其单击事件过程如下： Private Sub Command1_Click() Dim x As Integer，y As Integer Static z As Integer x=3：y=5：z=y Call f(x，y，z) Print x；y；z End Sub Private Sub ffByVal a As Integer，ByRef b As Integer，c As Integer) a=a+a：b=b+b：c=c+c End Sub 运行程序，单击命令按钮时，3个标签中显示的内容分别是