The density of a piece of plastic from a broken car window was determined.  The sample weighed 211 g and occupies a volume of 179 cm3.  1.  The density of this plastic is [ Select ] 0.85 2.11 1.18 1.79 3.78 g/cm3.  2. Based on the list of polymers below, the plastic is most likely made of [ Select ] PP LDPE HDPE PS PAN PMMA PLA PET PVC PTFE . Polymer Abbreviation Polymer Name Density (g/cm3) PP polypropylene 0.900 – 0.910 LDPE low density polyethylene 0.917 – 0.940 HDPE high density polyethylene 0.940 – 0.970 PS polystyrene 1.040 – 1.050 PAN polyacrylonitrile 1.110 – 1.150 PMMA polymethylmethacrylate/acrylic 1.170 – 1.200 PLA polylactide 1.230 – 1.250 PET polyethylene terephthalate 1.300 – 1.400 PVC polyvinylchloride plasticized 1.350 – 1.700 PTFE polytetrafluoroethylene 2.100 – 2.200  多重下拉选择题