因此，合理的确定预防维修周期是对设备进行科学维修决策的必然要求。
Therefore reasonable conformability of preventive maintenance cycle is necessary demand of scientific equipment maintenance decision.
维修培训是系统生命周期内的重要环节。
Maintenance training is a vital node in a system's life circle.
维修培训是系统生命周期内的重要环节。
Maintenance training is a vital node in a system's life circle.
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