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。请选择正确的程序段是( ),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 Dim i As Integer Dim Ksc As Ang Open ______ Y=14159/180 For i=1 To 90 Ksc.K=i Ksc.Sinx=Sin(i*Y) Ksc.Cosx=Cos(i*Y) Next i Close #2 End Sub