下列事件过程的功能是：建立一个名为Datal的随机文件，存放角度值及这些角度的正弦函数值和余弦函数值，角度为1，2，3，…，90。请在空白处填人适当的内容，将程序补充完整。 Private Type Ang K As Integer Sinx As Single Cosx As Single End Type Dim Ksc As Ang Private Sub Form_Click() Dim Y As Single Open“c:\Datal.txt”For Random As #2 Len=10 Y=3.14159/180 For i=1 To 90 Ksc.K=i Ksc.Sinx=Sin(i * Y) Ksc.Cosx=Cos(i * Y) ______ Next Close #2 End Sub