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介绍在一个两级微机测控系统上实现的实时多任务运行环境，重点阐述了其中的任务调度策略、扩展的ＰＩＯ任务、任务级流水处理的设计思想。
The real-time and multi-tasking operating environment implemented in a two-level computer monitoring and control system is introduced, and the design of task scheduling strategy, extended PIO task and task-level water treatment are described emphatically.