进一步以《机械制图》课程为例介绍了网络资源库的具体实现，其中包括积件库、虚拟库、系统运行与维护等模块。

And then it introduces the realization of the network resource database, which includes integrable ware database module, virtual database module, system running module and maintenance module.

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中国石油A 1项目(即：勘探与生产技术数据管理系统)进入生产性运行阶段后，系统的维护管理就显得尤其重要了。

Petrochina A1 project turn into the empress of the movement stage of production, the maintenance management of system seemed to be particularly important.

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关键数据的备份与恢复操作已经成为系统日常运行维护的一个重要组成部分。

Backup and recovery operation of crucial data have become an important part of systematic daily operation maintenance.

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