对于关键应用报警可设置为激活应该含氧量超过了一套控制上限。
For critical applications an alarm can be set to activate should the oxygen level exceed a set control limit.
提出了一种基于时间片的抢占控制模型，为每个任务分配一个可抢占次数的上限。
A preemption control model based on time slice is therefore proposed to assign every task on upper limit of preemptable frequency.
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