Styrofoam,orpolystyrene,isalight-weightmaterial,abou...
问题详情: Styrofoam,orpolystyrene,isalight-weightmaterial,about95percentair,withverygood insulation(隔热)properties,accordingto.Itisusedinproductsfromcupsthat keepyourdrinkshotorcoldtopackagingm...
问题详情: Styrofoam,orpolystyrene,isalight-weightmaterial,about95percentair,withverygood insulation(隔热)properties,accordingto.Itisusedinproductsfromcupsthat keepyourdrinkshotorcoldtopackagingm...