VB小程序`帮找个错误```
Private Sub Command1_Click()Dim m_max As Double
Dim m_map As String
m_max = Text1.Text
Select Case m_max
Case Is < 0
m_map = "您输入的数据不准确"
Case Is < 50
m_map = "建筑应高度小于25M"
Case Is >= 50 < 250
m_map = "建筑应高度小于40M"
Case Is >= 250 < 450
m_map = "建筑应高度小于50M"
Case Else
m_map = "建筑应高度小于60M"
End Select
Text2.Text = m_map
End Sub
请问``我那写错了呢```
为什么建筑高度总是无法运行40M以后呢````