This article is a study of methylene chloride as a substitute for trichloro-fluoromethane in producing flexible polyurethane foam.
讨论氯甲烷替代一氟三氯甲烷进行软质聚氨泡沫塑料的生产。
Polyurethane foaming box ensures good heat preservation capacity, and so ice cubes become more melting-resistible and can be stored longer.
聚氨发泡箱体,保温性,冰时间长,不易融化。
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Unfortunately, the polyurethane foam he used is inherently unstable.
不,用聚氨酯泡沫天生不稳定。
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