A combo box is a single-line list box with a drop-down list from which users choose an option. You can assign the &quot; read-only &quot; property to the combo box so that users cannot enter other entries than those found in the list. If the form is bound to a database and the database connection is active, the
组合框是单行列表框，框中含有下拉列表，用户可从其中选择选项。可以为组合框指定 &quot; 只读 &quot; 属性，这样，用户就无法输入列表所含条目外的其他条目。如果将窗体绑定到数据库，而且数据库连接状态为有效，在文档中插入组合框后，会自动显示