Assistance to prepare preventive maintenance plan and equipment operation file.
协助制定设备预防性维修计划，建立设备运行档案。
US R&D is responsible for the writing and maintenance of this file.
研发部负责本文的编制和维护；
A copy of all maintenance contracts are kept on file in the Engineering office.
这份档案包括所有关于新工程的文件。
A copy of all maintenance contracts are kept on file in the Engineering office.
这份档案包括所有关于新工程的文件。
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