Polyurethanes can be which of the following (more than one):thermoplasticthermosettingelastomeric

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Polyurethanes can be which of the following (more than one):
thermoplastic
thermosetting
elastomeric

以下几种属于聚氨基甲酸酯/聚氨酯的是(不止一项)：
热塑性塑料
【化】热固的
合成橡胶
大体这意思,太专业了
到底哪个是,我也不清楚……

Polyurethanes can be which of the following (more than one):thermoplasticthermosettingelastomeric can be Can be tough,Can be strong. can be.must be区别may be can we be friends? how can that be? how can it be.. You can be beautiful I can be your how can be how can that be I am can be You can be heartless can we be friends. Ah ......I can be it can be done as can be There Can Only Be