通常，它们的实际加工时间少于其加工时间的30%。
Often the actual chip-production time is less than 30% of the total cycle time.
这将会占用大量的机床实际加工时间，降低机床的效率。
Therefore much time of real machining is consumed, the efficiency of machine tool is reduced.
每个工件具有一个正权因子、一个释放时间和一个加工时间。
Each job is characterized by a positive weight, a release time and a processing time.
每个工件具有一个正权因子、一个释放时间和一个加工时间。
Each job is characterized by a positive weight, a release time and a processing time.
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