n = 6

d(1) = 23: d(2) = 31: d(3) = 19: d(4) = 33: d(5) =58: d(6) = 28

k = Abs(d(2) - d(1))

For i = 3 To n

 If Abs(d(i) - d(i - 1)) > k Then k = Abs(d(i) - d(i - 1))

Next i

Text1.Text = Str(k)

上述程序段执行后，文本框Text1显示的内容是（  ）

Dim a(1 To 15) As Integer

Private Sub Form_Load()

  Dim i As Integer, t As Integer

  Dim s1 As String, s2 As String

  Randomize

  s1 = ""

  For i = 1 To 15

    a(i) =  ①    

    s1 = s1 + Str(a(i))

  Next i

  Text1.Text = s1

End Sub

Private Sub Com1_Click()

  s2 = ""

  For i = 1 To 15

    s2 =  ②    

  Next i

  Text2.Text = s2

End Sub