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Common thermoplastic polymers such as polystyrene and PVC can be _______ as often as they are reheated. A) hardened B) shortened C) softened D) strengthened
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Common thermoplastic polymers such as polystyrene and PVC can be _______ as often as they are reheated. A) hardened B) shortened C) softened D) strengthened

User Canmustu
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The answer is A) hardened
User AndreasZ
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