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

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