先画一个复选框组check1(0)，check1(1)，check1(2)，
画几个根据情况定:
Private Sub Command1_Click()
Dim i As Integer
For i = 0 To 2
Check1(i).Value = 1
Next i
End Sub
Private Sub Command2_Click()
Dim i As Integer
For i = 0 To 2
Check1(i).Value = 0
Next i
End Sub
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