田家暖照全本加番外txt:高分子聚合物的分类问题
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Which of the following polymers are normally thermoplastic (more than one):
a.acrylics
b.cellulose acetate
c.nylon
d.polychloroprene
e.polyethylene
f.polyurethane
a.acrylics
b.cellulose acetate
c.nylon
d.polychloroprene
e.polyethylene
f.polyurethane