说明：  用户手册列出有用的参考资料，如： a. 项目的经核准的计划任务书或合同、上级机关的批文； b. 属于本项目的其他已发表文件； 本文件中各处引用的文件、资料，包括所要用
(User manual lists useful reference materials, such as: a. the project approved project plan or contract, approval of higher authorities b. The other part of this project have been published documents throughout this document refer to the documents, data , including the use of)