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

讨二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，保温性能，时间长，不易融化。