实时错误：对象名无效
[解决办法]
''Combo1.Text = "选择省份"
''Combo2.Text = "选择城市"
''Combo3.Text = "选择县/区"
Combo1.AddItem "选择省份", 0
Combo2.AddItem "选择城市", 0
Combo3.AddItem "选择县/区", 0
Combo1.ListIndex = 0
Combo2.ListIndex = 0
Combo3.ListIndex = 0
