Weekly topic: 5 wealth points for those who answer correctly, 2 wealth points for participation； Question 216

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Multiple-choice question: Polymer chemical reactions include reactions that lead to the destruction of the polymer structure, that is ( ). A Degradation and aging B Crystallization and cross-linking C Oxidation and polymerization —————————————————— Please note: We will close this thread after 24 hours, and at that time we will announce the best response (the most helpful answer), along with the solution and explanation. Charisma Reward: If you post a topic in this section within two days to provide a detailed explanation or discussion of the knowledge points related to this question, please reply/comments in this post to let us know, and we will ask a moderator to grant you charisma points. It is not allowed to simply copy and paste; original content is preferred, with at least some organization by the user along with personal insights and opinions.