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This article is a study of methylene chloride as a substitute for trichloro-fluoromethane in producing flexible polyurethane foam.

讨论了用二一氟三聚氨酯泡沫塑料的生产

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2022年考研英语

Unfortunately, the polyurethane foam he used is inherently unstable.

不幸的是,他使用的聚氨酯泡沫天生不稳定。

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China Daily 客集

Polyurethane foam sealant was used during construction at the first floor underground, releasing flammable gases that accumulated to reach combustible conditions.

地下一层施工作业中使用聚氨酯泡沫,释放易燃气体局部积聚达到可燃条件。

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