delphi if判断语句有点问题

Question

var
a:string;
begin
combobox2.ItemIndex:=0;
adoquery1.SQL.Clear;
adoquery1.SQL.Add('select top 1 Usrsup from denglu');
adoquery1.Open;
combobox1.Items.Add(Adoquery1.FieldValues['Usrsup']);
combobox1.ItemIndex:=0;
a:=combobox1.Text;
if a='超级用户' then
begin
combobox2.Enabled:=false;
end;

为什么做不了判断？？？

Answer 1

Trim(a)后看一下