The closed loop circulation, one of the most economical and effective treating methods, should be developed.
闭路循环是最经济最有效的处理方法之一，应予以推广。
Using the central control system PLC, intelligent temperature controller and pressure gauge to replace the three pen recorder to realize the closed loop circulation and record of outer temperature.
采用中央控制PLC、智能温控器及压力仪表等替代原进口三针记录仪，实现外温的闭环控制和记录；
Such endeavor promoted the substitution of the traditional and unidirectional linear economy for the material closed-loop flow circulation economy having material circulation utilization as its core.
这种努力促使以物料循环利用为核心、物质闭环流动型的循环经济，取代传统的、物质单向流动的线性经济。
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