They can operate on a single document or a selection of them.
它们可以操作单个文档或者一组文档。
If the control is set to single-selection mode, this property returns the one selected item.
如果将控件设置为单选模式，则此属性将返回一个选定的项。
If the control is set to single-selection mode, this property returns the one selected item.
如果将控件设置为单选模式，则此属性将返回一个选定的项。
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