1, homology: the efficiency and yield of polymerization can be improved by selecting monomers from the same source for polymerization.

2. Homosexuality: Choosing the same type of monomers for polymerization can reduce the generation of hybrids and improve the quality of polymers.

3. High reactivity: By selecting monomers with high reactivity for polymerization, the rate and efficiency of polymerization can be improved.