By using orthogonal test method, the selective study on the mixture proportion about a type of polyurethane concrete was processed.

采用正交试验，对一种聚氨酯混凝土的材料和配合比进行了选择性研究。

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Test shows that the proportion of refrigerant mixture is the key, and optimization can be judged in control of key temperature.

试验表明混合制冷剂的配比是自动复叠制冷系统关键问题，通过控制关键点的温度可以判断混合制冷剂的最佳配比。

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Test shows that the proportion of refrigerant mixture is the key, and optimization can be judged in control of key temperature.

试验表明混合制冷剂的配比是自动复叠制冷系统关键问题，通过控制关键点的温度可以判断混合制冷剂的最佳配比。

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