题目：
二次反应，主要是指一次反应生成乙烯、（）的等低级烯烃进一步发生反应生成多种产物，甚至最后生成焦或碳。
答案：
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二次反应，主要是指一次反应生成乙烯、（）的等低级烯烃进一步发生反应生成多种产物，甚至
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