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关系运算中花费时间可能最长的运算是______。

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接头拦截法;  电话调查法;  入户面访法;  邮寄调查法;  
设计花费时间长  设计花费时间短  开工时间较晚  开工后的变更容易带来索赔  
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Private Sub Form _ Mouse Up(Button As Integer,Shift AS Integer,_                  X As Single,Y As Single)     If Button=2 Then       PopupMenu mnuEdit,vbPopupMenuCenterAlign Or_         vbPopupMenuRightButton,X,Y,mnuEditOpen     End If   End Sub  Private Sub Form _ MouseUp(Button AS Integer,Shift AS Integer,_                 X As Single,Y As Single)     If Button=2 Then       PopupMenu mnuEdit,     End If   End Sub  Private Sub Form _ MouseUp(Button AS Integer,Shift AS Integer,_                 X As Single,Y As Single)     PopupMenu mnuEdit,vbPopupMenuCenterAlign Or_            vbPopupMenuRightButton   End Sub  Private SUb Form _ MouseUp(Button AS Integer,_                 Shift As Integer,X As Single,Y As Single)     If Button=2 Then          PopupMenu mnuEdit,2     End If   End Sub  
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