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结合国内现行设计规范和手册中的有关规定，讨论了制冷机组备用应考虑的因素和原则，给出了机组备用的组合参考方案。
Combined with the relevant provisions of the current domestic design codes and manuals, the factors and principles that should be taken into account for the refrigeration unit are discussed, and the combined reference scheme of the unit is given.