The safety evaluation of key process plants and vital departments has become more and more important in safety production of petrochemical trade.
关键生产装置和要害部位的安全评价工作对于确保石化行业的安全生产来说，已显得越来越重要。
As a key aspect of material cycle and energy flow of lake ecosystem, decomposition of lake aquatic plants is one of the main process of maintaining the lake ecosystem functions.
水生植物腐烂分解作为湖泊生态系统物质循环以及能量流动的关键环节，是维持湖泊生态系统功能的主要过程之一。
Thus by means of this chart for analyzing the process of medium-sized ammonia plants, the key to lower the system energy loss can be found.
并进一步根据所推出的公式，绘制成含氨混合气的有效能图。应用该图对中型氨厂流程进行分析，能很快地找到降低系统能耗的关键所在。
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