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介绍在中小型氮肥厂合成氨生产过程中，采用ＳＴＤ总线工业控制计算机，实现氢氛比自动控制的原理、硬件结构及主要软件流程．
Introduced in the small and medium-sized nitrogen fertilizer plant ammonia production process, the use of STD bus industrial control computer to achieve hydrogen than the principle of automatic control, hardware structure and the main software process.