70年代我国引进13套大化肥项目,带进了国际70年代初水平的仪表和控制系统。到70年代末,这些项目都进入了大修阶段,急需备件和后备仪表,同时我国新上的重点工程,也大最采用70年代水平的仪表,而当时我国的仪表水平还处于60年代的水平,不能满足我国经济发展的需要。党的十一届三中全会以后,我国实行改革开放政策,从而有 In the 1970s, China introduced 13 sets of large-scale fertilizer projects and brought into the international instrumentation and control system in the early 1970s. By the end of the 1970s, these projects had entered an overhaul phase and urgently needed spare parts and backup meters. At the same time, China’s new major projects were mostly using the instruments of the 1970s. At that time, China’s instrument level was still at the level of the 1960s. Can not meet the needs of China’s economic development. After the Third Plenary Session of the Eleventh Party Congress, China implemented a policy of reform and opening up, and thus