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Sub
Private 调节速度
100 'Loop
= End - 0; a1
Dim r Do .Left a0 - = Timer
Const r
Private True
Loop
End Sub a1 = 1
While 0 '设定右边界
r Sub Label1;CommandButton2_Click()
> t
t0 a0 设定左边界
t0 Label1;r
DoEvents
= Label1; <Timer 'CommandButton1_Click()
 .Left Do False
End Else
If
 .Left = =