The pressure parts construction, design criteria of water wall, calculation procedure of water circulation and selection of critical parameters for controlled circulation boiler are introduced.

介绍了控制循环锅炉的结构特点，水冷壁等系统的设计准则，水循环系统设计的计算步骤及设计中关键数据的选取。

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An electric actuator based on single chip computer AT89C2051 is introduced. The hardware selection for controller, criteria of software design and block diagram of program are given.

介绍了一种基于单片机at89 C2 0 5 1的电动执行机构，给出了控制器的硬件选用、软件设计原则和程序框图。

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