Monomers used for producing polymers should be（）.

Monomers used for producing polymers should be（）.
A.Unsaturated monomers　
B.Monomers containing carbon-carbon double or triple bonds
C.Saturated monomers　
D.Saturated monomers having more than 2 reactive groups　
正确答案：Unsaturated monomers　 ；Monomers containing carbon-carbon double or triple bonds ； Saturated monomers having more than 2 reactive groups