=== Page 1 ===
Equipment handover file (demo)
This demo file has three pages. Pages 1 and 3 carry a text layer;
page 2 is a scanned image without any text layer.
Use this file to practise mixed-document handling.

=== Page 2 ===


=== Page 3 ===
交接文件说明（演示）
第 2 页是扫描图片，没有文字层；第 1、3 页有文字层。
遇到这类混合文件时，逐页判断：有文字层的页直接提取，
扫描页先导出图片，再交给图片识字工具逐页处理。