您学习了如何设置平面文件资源适配器以及如何在应用程序中使用它。
You have learned how to set up the resource adapter for flat files and use it in an application.
file - realm - demo：展示如何使用用户和组的平面文件设置安全约束。
File-realm-demo: Demonstrates how to setup security restrictions using a flat file of users and groups.
第二十七条铁路与道路平面交叉的道口，应当设置警示灯、警示标志或者安全防护设施。
Article 27 warning lights, warning marks or safety protection facilities shall be set up at a crossing where a railway and a road intersects on a plane.
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