Usually，polymerization includes（）, based on the mechanism involved in forming polymers.

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• The fundamental reactions involved in addition polymerization are（）.
• Thermoplastics are mainly prepared by addition polymerization.
• In condensation polymerization, two monomers, dimers, trimers, tetramers, or oligomers, can react with each other at any time.
• Through controlledliving free-radical polymerization (CRP), molecular weight distribution could be narrowed greatly, and PDI cou