题目内容

阅读以下应用说明及Visual Basic程序代码，将应真入______处的语句写在答题纸的对应栏内。
[应用说明5.1]
应用程序的窗体中有1个下拉式列表框(名称为Combol)和2个文本框(名称分别为Txt1和Txt2)。运行时，用户从Combo1的列表中进行选择，程序就会将选中条目的内容及编号(从0开始)分别在文本框Txt1和Txt2中显示出来。
[程序代码5.1]
Private Sub Combol_Click()
Txt1，Text=Combol. (1)
Txt2．Text=Combol. (2)
End Sub
(注意：可供(2)处选择的选项有List，Index，ListIndex，LisCount，Number)
[应用说明5.2]
本应用程序的运行窗口如图2-1所示。
当用户在输入框(名为TxtIn)中输入数值数据，并从下拉式列表框(名称为CmbOp)中选择所需的运算后，输出框(名为TxtOut)中就会显示运算的结果。用户单击“清除”按钮(名为CmdClear)后，输入框和输出框都清空。
[程序代码5.2]
Private Sub CmbOp_Click()
Dim DataIn As Double，DataOut as Double
DataIn＝(3)
Select Case (4)
Case“取整数部分”
DataOut=Int(DataIn)
Case“求平方根”
If DataIn＜0 Then
MsgBox$(“负数不能开平方!”
Else
DataOut=Sqr(DataIn)
End If
Case“取绝对值”
DataOut=Abs(DataIn)
(5)
TxtOut.Text=str$(DataOut)
End Sub

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