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七十年代以来,随着微处理机技术的发展,集中分散型控制系统、可编程逻辑控制器等新型自控装置的出现,正迅速地改变着化工生产过程控制的面貌。它们对于具有连
Since the seventies, with the development of microprocessor technology, the emergence of new decentralized control systems and programmable logic controllers are quickly changing the face of chemical process control. They have to connect