ANSWER:
1. This packaging material is resistant to high temperature but has poor quality temperature and becomes brittle. A. polyethylene C. polystyrene B. polypropylene D. polyamide
ANSWER:a.polyethylene
2. Which of the following does not belong to the group? A. polyvinylchloride C. polystyrene A expanded polystyrene D. polypropylene
ANSWER:D.polypropylene
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