[填空题] 执行下面程序,单击Commandl,则图片框中显示的第一行是(),显示的第二行是() ,最后一行显示的是 () 。Private Sub Command1_Click()Dim a(3,3)As IntegerDim i As Integer,j As IntegerFor i=1 To 3For j=3 To 1 Step -1If i>=j Thena(i,j)=i-jElsea(i,j)=j-iEnd IfNext jNext iFor i=1 to 3For j=3 To 1 Step -1Picture1.Print a(i,j);Next jPicturel.PrintNext iEndSub