预防性养护的关键问题是养护时机的确定。
The critical problem for preventive maintenance is how to confirm the maintenance time.
订货型生产企业中，生产优先权的确定是制订生产排程的关键问题。
Production priority is a key issue in production scheduling in MTO (make to order) enterprises.
确定零件组的参考模式是零件分类系统的关键问题。
To define the part cluster reference patterns is the key in part classification system.
确定零件组的参考模式是零件分类系统的关键问题。
To define the part cluster reference patterns is the key in part classification system.
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