max = 0
For p =
amin = a(p): amax = a(p)
i = p + 1: j = p + 19
Do While
If a(i) > a(j) Then
If a(i) > amax Then amax = a(i)
If a(j) < amin Then amin = a(j)
Else
If a(i) < amin Then amin = a(i)
If a(j) > amax Then amax = a(j)
End If
i = i + 1: j = j - 1
Loop
If Then max = amax - amin
Next p
Text1.Text = "最大波动值为:" + Str(max)
上述程序段3个方框处的语句分别为( )