在窗体上画一个命令按钮Command1和两个文本框，名称分别为Text 1和 Text 2 Text 2。编写如下两个事件过程： Dim str As String, strl As String Private Sub form_load() Text1. Text = " " Text2. Text = " " Text1. Enabled = False Text2. Enabled = False End Sub Private Sub Form KeyPress(KeyAscii As Integer) str= str&Chr(KeyAscii) End Sub Private Sub Form_KeyDown(KeyCode As Integer, Shift As Integer) str1 = strl&Chr(KeyCode) End Sub Private Sub Command1_Click() Text1. Text =str Text2. Text = str1 str= " " str1= " " End Sub 当在设计阶段把窗体KeyPreview属性设置为True时，程序运行过程中，在键盘上输入小写字母abc，然后单击命令按钮，则文本框Text1中显示的内容为 ______ 。