当发生Form_Click事件时，窗体上显示的第三行是( )。 Option Base 1 Private Sub Form_Click()Dim i As Integer，j As Integer，k As IntegerDim a(5，5)As Integer For i=1 To 5 k=1 For i=1 To 5 If(i＜=j)Thena(i,j)=kk=k+2 Elsea(i,j)=k+1 End IfNext j Next i For i=1 To 5 For j=1 To 5 Print a(i,j)；Next jPrint Next i End Sub

A．1 3 5 7 9

B．2 1 3 5 7

C．2 2 2 1 3

D．2 2 1 3 5

立式车床适合于车削直径大，工件长度较短的重型工件。