Water purification systems may follow the initial pretreatment steps in various sequences depending on the characteristics of the water and the design of the system.

水纯化系统可能跟随在初始的预处理步骤后面，根据水规格参数的不同有多种顺序和系统设计。

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Reverse osmosis desalting system includes two parts: raw water pretreatment and membrane system.

前言：反渗透预除盐系统一般包括原水预处理与膜系统两部分。

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The heating plant is consisted of hot water boiler of straw burning and accessories system (i. e., collecting system and pretreatment system).

供热系统由秸秆直燃热水锅炉和配套系统(秸秆收集和前处理系统)组成。

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